You have to support 99% Hitler who wants to hand out cookies before committing mass slaughter because if you don’t you’re supporting 100% Hitler and no cookies, which would make one a monster.

There are actually more options beyond those, if people would take them. It’s a self-fulfilling prophesy to say that other options aren’t viable. It’s better to try to fight against that than to be complicit in supporting it. If it’s impossible, then it would be better to boycott the system altogether. Under no circumstances is supporting genocide morally justified.