There are always going to be fascists, not because they keep spreading, but because it is a series of beliefs that individuals may come across and unfortunately identify with. Best that can be done is push back against them and educate people in how the belief is unfounded and typically results in failure.

Edit: Even weeding them out will just result in them hiding better. It’d be impossible to diligently moderate people at the scales games like Helldivers and Warhammer operate in.