"Feh! Look at those deviants! All huddled together in their city of sin and decadence!"
"Yeah, they don't deserve our Lord's bounty!"
"They don't know the freedom that service to His magesty provides!"
"..."
"...... so, are you going to go out for food?"
"WHAT? Are you crazy? I can't risk any chance of having to meet some outsider! I'd rather stay here inside the Tower and work for His greatness!"
"Well, I'M not going out either, as I'M the Lord's favorite!"
"No, I AM!"
"NO, I AM THE BEST SERVANT!"

Those who held themselves in the "safety" of the tower had sucessfully isolated themselves. Now, they have nothing to do but isolate and divide themselves.

Meanwhile, the people of the city lived in peace.