I feel like it depends on the board. I used to browse /mu/ in 2010 and by 2017 the board went from being relatively chill to being filled with screeching fascists.

I remember /k/ and obviously /pol/ (or /new/ ) always being Naziified.....that stuff was always there, it just wasn't as focused or complete in it's domination. I mean people would unironically post the Communist Manifesto on /fa/

Now you can't escape it anywhere on the site, and pretty much everyone who still uses the site at this point is some flavor of right wing