Shirts and jeans litter the asphalt, the empty fabric limbs askew as if they're attempting to escape. Blood smears Sarah's lips as she struggles against the chest of a dirty looking man with a beard. Terror. Terror is the only word my mind can seize on and it forgets what it means. I forget how to think - to move.

The city had grown, implacably, spreading its concrete and alloy fingers wider every day over the dark and feral country. Nothing could stop it. Mountains were stamped flat. Rivers were dammed off or drained or put elsewhere. The marshes were filled. The animals shot from the trees and then the trees cut down. And the big gray machines moved forward, gobbling up the jungle with their iron teeth, chewing it clean of its life and all its living things.Until it was no more. Leveled, smoothed as a highway is smoothed, its centuries choked beneath millions and millions of tons of hardened stone. The birth of a city... It had become the death of a world.

An enlightened person raises the level of the consciousness of the entire community.

City of Wizards is normally quite a GOOD thing, since only Good WIZARDS seem able to live together. . . .There have been cities of EVIL Wizards in the past. You will occasionally come across the sites of these, reduced to a glassy slag during the ultimate disagreement.

Rincewind stared, and knew that there were far worse things than Evil. All the demons in Hell would torture your very soul, but that was precisely because they valued souls very highly; evil would always try to steal the universe, but at least it considered the universe worth stealing. But the gray world behind those empty eyes would trample and destroy without even according its victims the dignity of hatred. It wouldn't even notice them.

This is what evil does; it makes choices for others in the name of religion, in the name of government, in the name of community, in the name of personal gain, that these individuals are best able to make for themselves.