I would argue that the VAST majority of the people pushing these ideologies do not believe the things they profess to believe and that they are pushing their followers to subscribe to. It is rank tribalism with the only goal being money & power for themselves at the expense of anyone that they deem to be a threat. It really is a zero sum game.
There are the useful idiots that I would classify as the true believers, but their beliefs have often times been coopted either due to poor education or coercive indoctrination of assorted varieties (like religion for example).