Im going to play devils advocate, when you look at the subreddits banned there are those that are banned for unknown and petty reasons (Tumblrinaction), however

Im going to play devils advocate, when you look at the subreddits banned there are those that are banned for unknown and petty reasons (Tumblrinaction), however at the same time extremely radical or racist subreddits are also included (alt right ones, some extreme left and coontown fat people hate). And if we judge reddit with 4chan the "free" speech platform, you will notice that 4chan is plagued with extremism and anti-social views, which in some ways is because they don't censor and is 100% anonymous to each user. Personally some censorship is good to not allow the patients running the asylum, but also make sure you don't overreach.