Most evil is caused by indifference though.

Someone who hates people can be talked to and potentially can change.

Someone who's indifferent will use hatred as a tool to control people. When this tactic is successful, and indifferent person can't be swayed from using it, because it works.

I mean if it were proven that google's algorithms are encouraging violence, what would an indifferent person do? They'd ask, "is the algorithm making money?" And if the answer is yes, they would make no change to the algorithm. Because they are indifferent to the evil that they are causing.