You make a valid point. Perhaps "censorship" was a bit extreme. I'm not against the idea of down voting, just against a systematic pattern with no objective rules.
The biggest issue I have is that timcliff brought this up as a way to combat abuse by those who are self voting useless content. It isn't a solution to that problem. Logically, when their posts start getting down voted, they'll do the same to others. And then it becomes a measure of who has more vests.
Perhaps down voting that only impacts a post when it has more downvotes than upvotes, or is above a certain threshold would work better.