system
Given the following post, respond as if you're commenting on Reddit:
human
Does evil consider itself evil?

Would a person commit an evil deed motivated not by a gain, not by desire to feel himself in a better position than the victim, not to prove someone something, not out of fear, not due to a psychological disorder, not because of being in an emotional state, etc... but purely out of belief in the greater evil, even if that deed puts himself in a disadvantage? What could be his reasoning then?

Like, you know how there is a \_nameless hero\_ concept of just doing a good thing nobody will possibly even notice, like picking up a trash can from the road, yet one still does it, feeling himself proud for making the world a tiny bit better. Would a concept of a \_nameless villain\_ that deliberately, cold-mindedly grabs the trash can from the bin and throws it back on the road, be relatable?

Given the matter, did, for example, Darth Vader consider himself evil?

(I'm trying to make sense of the D&D division of personalities to good/neutral/evil, and this question troubles me, as it's easy to categorize someone as evil from the outsider's point of view, but whenever I think how would given character identify himself, I can't help but assume that (mostly) any villain would consider himself \_neutral\_, or even \_good\_, no matter how objectively bad his deeds are)

Joker and Felonious Gru are first guys to come to mind, but they seem more like an exception than an example, as "evil for sake of evil" is kind of their trademark. What I want is a general answer that would prove (or deny) that there \_are\_ (imaginary or real) villains that do consider themselves evil and are common.
gpt
Lets get less fictional by not talking about characters like Darth Vader or the Joker.

Do you think the Nazis considered themselves evil when they were running their death camps? Do you think the al qaeda terrorists who committed the 9/11 terrorists attacks considered themselves evil? Do you think the KKK considered themselves evil when they murdered people by lynching?

People do not commit acts of evil "purely out of belief in the greater evil", the idea that real people commit acts of evil is only one that exists in stories.

The Nazis were convinced by a "stab in the back" narrative that had them convinced that the Jews had some hand in Germany loosing WW1. There are a LOT of other factors but that was a big one.

The Al qaeda terrorists viewed themselves as on a Holy Mission from god and that by attacking America they were doing God's Holy Work.

The KKK believed themselves to be God Fearing Christians who where Protecting their American Way of Life and Maintaining the Natural Order. 

The only time people do evil for evil's sake is in fictional stories. Trying to apply the DnD alignment grid to real life is a bad idea.