Timboli: I don't believe in Evil as an entity or force, but I certainly believe some people perform acts of evil, and it is not just down to how individuals or societies see it ... that's a cop out.
There are things out there that are bad no matter how you look at them ... though some like to cover them in a veneer of superficial goodness on occasion. At the end of the day, seeing something bad as acceptable or good, is a mental issue and all about lies to self.
Before I go in further detail why I consider your position to be nihilistic and "cop out" as you called it, let it be clear that I more or less agree with Nietzsche when he said:
"It goes without saying that I do not deny - unless I am a fool - that many actions called immoral ought to be avoided and resisted, or that many called moral ought to be done and encouraged - but I think that the one should be encouraged and the other avoided for other reasons than hitherto..."
Other reason for doing moral actions, in my case being - because I can. Though I admit I can also be a relatively big asshole for the same reason.
Moving on - to call something good or bad is to put value on something, to give it an element which that something (probably) didn't have until an individual constructed it. To believe otherwise is to deny the world as it is, or nihilistic. I am well aware that individuals are capable of bringing intentional and
unnecessary harm to other living beings, but that doesn't make it bad, my judgement of them being asshole makes it.
Finally, to call malevolence/being a massive douchebag mental issue I do not believe is correct way to put, since many sociopaths are perfectly capable of functioning in society and achieving very high position in it, not to mention that it is actively encouraged in, say, the times of war.