I really dislike this belief (that has at least been expressed here) by some that X is okay because they-really-believe-it. This has a real Road to Hell stank on it.
It is incredibly convenient when your predictions or supposed beliefs go south. Well, we really believed that we were doing it for the betterment of human kind. And we really believed that X was an existential threat that was inevitable in which case we had to step up and do it because we we the only good guy ideologues. So sorry but not sorry.
I also don’t care if commenters know rank-and-file on the inside that “really believe it” as well. Not for one second.