Fundamentally I think the problem is less political and just that this is an Old Internet site still being more or less operated according to Old Internet rules. And if what you want is a paradigm shift in that regard I think we can't offer that.
If we start banning people with political opinions I don't like this site will have 5 users. This simply isn't a viable way of going forward, as much as just letting people say racist shit and drive them off our site is. But if you are racist and we don't notice we don't really have a basis to act on.
I can comment on this specifically but with the politics thread one of my big problems modding it was that I was in there arguing on the left side so banning people according to my personal feelings of what is or is not over the line would basically result in me banning everyone who disagrees with me in there, which I consider poison for good discussion culture.
more than that i am not convinced you have a positive effect just banning every right wing opinion from niche sites, like the worst right push the internet ever got was because people managed to characterize all leftism as wanting to shit on everything nerds like and ban everything, and to this day you can go into a random fighting game discord and get redpilled on the holocaust in 5 minutes but coherent leftist theory requires 500 years of googling and getting shouted at