Hmm...Don't PK priests for not healing you say?
I PK elves for being their smug elven selves and Ippin because they are small, greedy, and annoying little creatures who have invaded our world.
I also kill other mages because I despise their mundane and ugly academy-esque fashion sense.
In fact the only race I don't attack often are the Zerker Lion/Dog men. They understand that might makes right and I simply love the way they smash others over the head with their large wicked looking axes. This pleases me.
~An evil mage stereotype in a classless world