philosophy

See? You yourself can't fully understand what is evil and what is good for you. I'm just trying to prove that everyone has their own truth, their own evil and good. No maniac will say that they are doing evil because they have a different understanding of evil. And just because 99.99% of people consider certain actions to be evil, it doesn't mean they are right, that it is true evil.
P.S. I'm not justifying maniacs - it's just an example.