Well I've always thought that the only evil that can exist is the evil that other people construe as evil, for example;
Hitler (evil Cliché, I think so), people will think that he is evil because he slaughtered millions of Jews but if we took a trip inside his mind we would find out that he probaly thought that he was cleansing the world for the greater good.
So really Evil is something that is just left to the perceptions of people, personally I think that giving a jobless, homeless guy money is evil (not joking by the way >

).
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"I'm staunchly atheist, I simply don’t believe in God. But I'm still Catholic, of course. Catholicism has a much broader reach than just the religion. I'm technically Catholic, it's the box you have to tick on the census form: 'Don't believe in God, but I do still hate Rangers..'"