@Cyracuz,
Evil exists. To deny this fact is nothing more than to quibble about definitions and semantics. I think that what you're really saying, Cyracuz (and the second paragraph of your post suggests that I am reading your meaning correctly), is that no person ever commits an
intentionally evil act. (Echoes of Socrates' "No man errs willingly" here.) Every act has a perfectly legitimate reason in the mind of the perpetrator. But it does not follow that this perfect reasoning will be in any sense apparent to anyone else on the planet. It is the majority which will judge whether or not an act is/was evil.
I will go along with you to this extent: the concept of evil is cultural, not universal. It is very hard to get one's mind around a meaningful concept of a 'universally accepted' (or 'acceptable') definition of evil when acts which are considered abominale by one segment of society, i.e. one culture, are accepted as not only acceptable, but even laudable by another culture.