[msrenee]

People committing genocide also presumably don't wake up saying they're going to be evil again. Being able to justify an act to yourself doesn't make it not evil.

[Y_Y]

You don't have to presume, you can interview them!

https://en.wikipedia.org/wiki/The_Act_of_Killing

[baxtr]

But then what does make something evil? Nature clearly doesn’t distinguish good vs evil. We humans do.

[msrenee]

That's a much bigger question than whether one can commit an evil act without considering it evil.