It's material conditions. They can absolutely know, on some level, that our politics are more morally correct (what I guess you mean by "better") but also know, on some level that their politics benefit themselves personally more. They're siding with the politics that personally benefit them, and getting angry at the ones that are more correct but would mean they don't continue to benefit from exploitation of others if implemented. Then there are other people who might even themselves benefit more if all exploitation were ended but have bought into the arguments made by those further up the ladder.