I've come to a different way of thinking about religion lately and I'm going to give you ultimately the same answer as your other replies..

Religion has more to do about perceptual experience rather than objective reality. Religion literally tries to define the general nature of subjective experience. I think the reason that people argue (always needlessly...) is that there exists misunderstanding on this front. Any religion will argue that all humans struggle against unknowns that feels infinitely big. Religions will frame this as a relationship between the individual and the deity. The potential of your future self and the world's future is absolutely limitless and you, unfortunately, have only lived out one path in your life. From seemingly endless possibilities you basically limit them all down to the one decision you make at a time. There is obviously something special about it since you have singled it out from literally everything else. You have to be sure of yourself, to at least some degree, in order to be stable and to continue to at least uphold the path you're on.

Arguably the holocaust happened because of an increasingly waning sense that religion in the world helps us understand the idea of 'destiny' or what we are supposed to do. Nazi states would ideally have no religion.

Anyways, what I'm trying to get at is the idea that your subjective view of the world and its people defines the way you see the potential paths ahead of you. If you learn by example at all, and see that the world is solely merciless, cruel, unfair, etc. what is the chance that you're going to want to become the one force of charity on the planet instead of thinking that you should get yours before everyone else leaves nothing left for you? If you do see yourself as the 'one good guy', you still will be left with a massive ego from thinking you're the only one who knows the right path in life and be unable to listen to anyone.

Religion here doesn't really matter except in that it's sortof the go-to thing for most people that explains the nature of subjective reality. There's interpreting things harmoniously with the rest of the world, or misinterpreting things so you run into contradictions everywhere that require extreme reactions to fix.

Religion IS moral responsibility. And as OP said these people think they are fulfilling a moral duty. If you think that it's anything else, then you have no idea why religion was invented in the first place.