I agree in general with your philosophy of free speech, however, in this case, claiming that what reddit did is "censorship" is a bit misleading. This is Slashdot so I'm quite suprised you've been moderated so highly and that nobody has pointed it out yet; on the other hand perhaps many 'dotters just aren't aware of exactly what happened.
That's not censorship, that's compartmentalisation. FPH was allowed to exist and to be dicks by themselves in their own little corner of reddit. That's the point of subreddits. Again, reddit knew about FPH and was OK with its crap as long as it kept to itself. Only after they tried to spread their bullshit was the subreddit closed.