An interesting thread indeed. I agree with much of what has been said regarding word choice and doing wrong rather than being evil. When it comes down to defining evil, for me the best definition of evil action or intent would be doing the wrong thing completely willfully with full intent to do harm and complete understanding of the intent to harm and all it's implications. This means without rationalising the action too, and without any form of cognitive or emotional impairment. Every once in a while real evil may well crop up. I don't think it's terribly common though.