It seems like some kind of fallacy to insist that good done in the name of religion is never actually about religion, while evil done in the name of religion is

It seems like some kind of fallacy to insist that good done in the name of religion is never actually about religion, while evil done in the name of religion is 100% only about religion. If nothing else, I don't know how you could even begin to prove that. It sounds like something people believe without evidence because they find it comforting, which is pretty ironic given the context.