To negate cheating would be pretty ambitious right now. The main thing we're equipped to do is help balance retaliation if a) the community already uses Steem to communicate and b) community leaders were staked appropriately. So, that's a big hurdle, even now.

But if those were in place, this kind of thing could be mitigated:

Update: Looks like they really need a blockchain-based solution, right now. The above video just got pulled. Details here: