There are material conditions to causing the actions which people think of as evil. Material conditions explain virtually everything about the actions of humans within capitalism. "We can't possibly know how people do evil things, they just are naturally evil in an unexplained way" is just admitting you don't know what material conditions would cause evil actions to happen. That is a *you* problem if you feel the same. You need to learn about dialectical materialism if you agree with their line of thought. This is your brain when you are ignorant of the incentives capital, both fiduciary and non-fiduciary kinds, does within capitalist societies.