political discussion was always common on the internet and would take over any board that did not aggressively moderate or quarantine it. furthermore, the culture war really began ramping up in the early 2010s with more overt progressive invasion of male hobbies and entertainment. sjws date from that period and progressive propaganda orgs like vox media gained massive influence.  everyone began arguing about the culture war because it was nigh-impossible to avoid. fans of tv, movies, video games and so on saw all their favorite franchises pozzed in front of their eyes. the sci-fi publishing industry showered awards on fruitcake cringelords like john scalzi. polygon pushed feminism nonstop. movies pushed feminism and blacks. etc
United States