I think the emphasis on dissent in left wing spaces can make it easier for such antisocial individuals to gain at least some influence. Some ultra-leftist places, I know they won't describe themselves as left wing but who cares, will behave in the most corrosive ways imaginable. Often much worse than shit you'll see on certain right leaning imageboards. It really seems to increase the more people hold on to ideas of correctness, or appearing correct, and purity.