Important disclaimer: I am not into any of the "bad" fetishes you mentioned. Also, I'm going to mention why being a fetishist in these things doesn't necessarily make you a bad person, but obviously, there ARE people who into these fetishes who ARE bad people.

A lot of the fetishes that you mentioned, as I understand them, aren't necessarily so much about the specific thing itself, but about the visceral sensations related to them, as well as the power exchange they entail.

There are a ton of women (normal, "vanilla" women who aren't furries) who are actually a mild to moderate fan of rape/kidnapping/gangbang fantasies (as evidenced by the popularity on independently published e-reader-type media sites of the "mommy porn" genre - just think of the popularity of Twilight and 50 Shades of Grey) - this is because fantasizing (through literature or art) is a safe way to indulge in an otherwise harmful, dangerous, and "bad" fantasy. It's a way to imagine being powerless and being taken and overwhelmed without actually having to go through it. It's a novelty, something you can only experience through fantasy. These women who fantasize about rape IN NO WAY endorse it. It's perfectly possible to get off on sexy rape fantasy art/stories and find real rape horrific. It does not make a person a sicko.

Think of milder, more common "dangerous" sexual fantasies - unprotected sex with a stranger, random wild sexual abandon at a club or party. It's the same idea, the same liberation that lets people explore the idea of "dangerous" settings without experiencing them.

As for some of the other fetishes, like how rape fantasy can be more about being taken and overwhelmed and powerless, a lot of the others are about what they symbolize or represent and the gain/loss of power than actually liking the smell/taste of poop, for instance. I, personally, find poop/vomit fetishes super gross, but I still get where they're coming from. Have you ever worked with clay, enjoyed the visceral sensation of playing/working with it? Have you ever enjoyed the smell of something "bad" like gas or alcohol or permanent markers or glue? Have you ever enjoyed, as a child or otherwise, just getting super wet in the rain, or super dirty in the mud, or getting batter all over you while you cooked? Do you understand the appeal of Dominance/Submission and consensual power exchange? If the answer to any of these is yes, I think you have the potential to understand the potential appeal of scat/vomit. Something about the "gross" or demeaning nature of it adds a special interest to it, like how rape adds an element of danger and powerlessness.

The difference here is that many of these fetishists will engage in this sort of thing in real life, because it's not dangerous or illegal in the same way that kidnapping/rape is. And, I mean, I think it's gross, but I can imagine it's just that sheer enjoyment of aesthetic pleasure of kneading dough or playing in mud or feeling sand between your toes, but applied to something that we don't particularly like, combined with the sort of twisted joy of knowing it's "dirty."

Then there are the more fantastical versions. People who love the idea of being eaten and digested, then pooped/farted out. It's a combination of the above, but also with the idea of becoming "powerless" and dehumanized (like the appeal behind human furniture, related to the appeal of submission and humiliation). In fact, sometimes, it can actually be quite emotional and symbolic - the appeal is entrusting someone wholly, body included, and becoming a part of them literally, and creating a literal product that only the two of you together could make - the willingness of one party to be demeaned by the other is symbolic of the trust/love for the other person. A lot of the appeal in submission and humiliation is actually not sexual at all, in that often times, "subspace" (the mental state of mind these people voluntarily put themselves in) can keep them from being able to orgasm at all.

And if you don't get why people might want to experience different states of being, well, it's the same basic principle that drives people to do drugs and drink alcohol.

Again, you don't have to be an emotionally broken, medically mentally sick person to like these things.

As for extremeness in fetishes, I think this one is more obvious. It's just taking something people like, and going overboard, dialing it to 11, or whatever term you want to use for it, and again, the extremeness is an expression of fantasy, something that can only happen in art/literature, and the fantasy and extremeness adds to it a fun/appeal that is separate from the original thing itself. Like taking the enjoyment of rough sex, and then fantasizing about being raped. It's the same kind of idea.

People like these fetishes for various reasons. Some of them I've mentioned above. And some people, you might say, are literally sick, but those are in the vast minority, I think - the people who actually try to murder and eat other people, the people who create real life snuff videos, etc. But for most people, it's just a weird thing they like, and it doesn't make them bad people.

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And again, I honestly don't like any of the fetishes mentioned. I do think power exchange is sexy on an emotional level because it represents a special level of communication and trust typically not found/required in normal relationships, but as far as BDSM is concerned, that's pretty mild.

Why defend them if I'm not one of 'em? Mm, because I think you're being unfair, and perhaps you might enjoy or gain benefit from hearing an attempt at a serious explanation. It's not written terribly well, but hopefully it still gets the point across. I have a few "vanilla" friends myself who don't get this stuff - y'know, believe anyone who's into any fetishes/non-vanilla whatsoever must be sick or broken or have been emotionally/sexually abused as a kid - so this is a discussion I've had before XD

And also, on a personal level, I like understanding points of views I don't share. I find it interesting. *shrugs* In this case, though, I definitely get the grossness and seeming appalling nature of liking these things :b so I didn't feel the need to get into that much: you already know how you feel about it, I don't need to explain it :b

Also, I think these sorts of sentiments is throwing the idea of psychological illness around in a dangerous manner. Dismissing other people's ideas you don't agree with as "They must be sick broken individuals" can be a slippery slope and a good way to, on an unconscious level, give yourself a "legitimate excuse" to treat these people with disrespect or as less-than-human, which would be wrong. Like seeing black people as primitive neanderthals helped make white people feel like, "Not only is it okay to enslave these people, but we're doing them a favour *smug self-satisfaction*" Obviously, these don't equate, but as I said, it can be a slippery slope. A friend of mine who can get very emotional about things can go from rationally thinking people who like poop are gross to suddenly saying fetishists should all be sterilized :V

It's also arguably a bit unfair to all the decent people who suffer from any kind of psychological disorder. Just because a person has clinical depression or social anxiety or paranoid personality disorder doesn't mean they're "insane" and should be looked down upon.

Also, finally, what's wrong with people liking weird/gross shit, so long as no one is getting hurt? Some people will always like stuff that other people find gross or weird, and there will always be people who turn around and say that the things YOU like are gross and weird (like my friends think anyone who is a furry is inherently fucked in the head), so... I find in general, adopting the sentiment of "Whatever floats your boat!" is a pretty fair one :b You don't even have to like or agree with it, just so long as no one is getting hurt.

((lol, it's funny, because it's hard saying that, knowing that a lot of people's fetishes involve anywhere from mild to extreme levels of pain :V but I think you know what I mean))

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TL;DR - not everyone who likes these things are inherently bad creepy people, in that I think there are non-"bad creepy" reasons to find appeal in them. But obviously, some of them DO like them for the wrong reasons (because they DO want to kill people, because they DO want to hurt living things, because they DO want to rape and emotionally destroy), and they deserve our pity (and avoidance :V) :b Can you imagine only being able to orgasm by imagining yourself choking the life out of another person? Modern medicine can't really "cure" these things, you're stuck with it for the rest of your life in a society where you can never realize that part of yourself without going to jail for it :b

Well, I wanted to know if I was a prude or not for viewing specific fetishes in a negative way and those who have a love for those fetishes when they are extreme violent and destructive in nature.

Mind you, I have no poor view towards anyone with a mild interest in any fetish, even those mentioned by me. Its when they are depicted in an extreme that concerns me.

If anything you have completely valid opinions... and I can completely support them.

No, I think by definition you aren't a prude, or at least, not any more than the average person. Extreme fetishes, by their very definition, are extreme, so it's not surprising or strange if normal, unprudish people find them excessive, offputting, or distasteful - it's practically in the definition.

I think you are right, to be honest. Maybe I just can't get the hidden idea of those fetishes, but to me all of that people who loves such things are NOT normal.
I don't think all of them are bad people though, but they have psychological trauma, thats for sure. They trying to return to the traumatic memories or to get rid of their complexes, using dark themes like killing, gore, vore, etc. There is nothing sexy for a healthy person in this.
Thats just my own opinion, so I'm not trying to offend anyone by saying it.

If anything, you have a valid opinion, and it does answer my thoughts as to whether if I was being a prude or not.
That said, the previous commenter mentioned people with an interest and desire in those fetishes are not always bad people, and you did too, and I believe that as well and agree with it.
I... just tend to view when it comes to extremes that that might be a bad thing.
Anyways, thanks for stating your opinion.