People tend to think of online communities as democracies where the freedoms they're accustomed to from their normal lives apply.

So when a post gets deleted by a moderator, people tend to think of it as a freedom of speech issue. There's a whole constitution out there specifically defending anybody's right to create a pro-Nazi subreddit, and to otherwise post anything they please on the site so long as it's not illegal, right?

Not really.

Not at all, in fact. Reddit is not the United States. It's Reddit. Online communities are not democracies any more than your back garden is a democracy. You pull weeds, plant seeds, and otherwise encourage the plants in your garden to comport themselves in a manner that ends up with a pleasing result. It's your garden, so you have the absolute right to pull weeds. The weeds get no say.

Reddit seems to have forgotten this for a while, and as a result they started sliding until they became, well, Reddit. The community we're currently discussing this in, on the other hand, has been a lot more conscientious in cultivating the type of garden it would like to see. And I think we can all say the result is a lot more pleasant than a less tended place such as Reddit or 4chan.