Heavy handed speech moderation is what is starting to happen on reddit.

It works on HN

These things never stay contained though. The hate subreddits feed off of and seep into the rest of the site. In the old days someone had to make a conscious decision to visit a site like Stromfront. You weren't going to go there unless you already were interested in racist ideals. On Reddit those ideals are mixed in with everything else. This makes it harder to notice you are being exposed to hate and/or influenced by it. The end result is that Reddit is a boom to recruiting for hate groups.

There are three main ways of interacting with Reddit: posting, voting, and commenting. Hiding the obvious hate subreddits helped address the posting of topics. That was an important step and I don't want to diminish it. Reddit has tried to address the voting aspect with various tweaks to the ranking algorithm but whether it has been effective is still debatable. They haven't done anything as far as I'm aware to address hate comments. That is left completely up to the users and moderators.

>who cares?

Victims?

> if your vast majority of users doesn't see it or know where to find it, who cares?

If those channels become extremist echo chambers, then the government could care when terrorists start being made on the site, affecting Reddit's PR in the long run. I know of several subs that are full of such extremist vitriol. Since they're a global website, they've got to consider things like long-term social impacts of their content.