Unfortunately fascist spaces will exist and cannot be prevented because of the core nature of Lemmy/fediverse architecture. Anyone can start their own instance and post whatever they want.
However, if the main popular instances defederate with them, then most users won't have to see those posts.
I have definitely seen studies saying that people who play video games are better surgeons. Surgeons who don't play video games take longer to develop their fine motor coordination to the same level of competence.