swarthy
None of those groups ever "raided" anyone, unless you define it as linking from one subreddit to another. None of them ever encouraged downvoting, or even participation (although you can't expect them to not participate at all).
Some -- or at least one -- of the Reddit admins is a participant of the SRS (Shit Reddit Says) community which is notorious for being #1 for "brigading" other subs and massively downvoting anything and everything they disagree with. They have never even been considered for a ban to my knowledge, even though they sometimes discuss things like killing men.
It's fine for Reddit to make a decision to ban a subreddit because it might garner some bad press. However, it is ironic that Reddit call, or even consider itself a bastion free speech. They have banned other politically incorrect subreddits before (jailbait).
If you look at the rules which offending subreddits supposedly violated, you'll see that they are really just a tool for Reddit admins to selectively ban whomever they want.
"..regularly raided by Stormfront" -- I actually laughed out loud at this. Please, grow up.