1) Censorship doesn't apply to just government. If you think it does, then you've never heard or seen self-censorship in action. Especially when someone says something you don't like and are then jumped on by people who get their feelings hurt over it.
2) So, they know that there's actual abuse? Or they're simply going on based by the feelings of people.
3) This isn't the first time reddit has done something like this either, they recently went after kotakuinaction for their boycott of the day, banning them from posting contact information which is public. At the same time, they(admins) were running their own stop something or other campaign with exactly the same type of contact information posted in exactly the same manner.
Reddit has a very selective enforcement policy, and that policy boils down to "freedom of speech, as long as we agree with it." Which of course is funny considering how it was founded on a anti-censorship platform. Then again, they just finished relocating to San Francisco, which is a hub of "feels over reality" hugbox.