Clearly there have been users whose posts have been overwhelmingly bad. Downvoting a bad post when it's posted isn't a problem. The problem we've seen is when someone decides to carpet-bomb all of a user's past posts, indiscriminately, in order to make some kind of "statement" against that user. Please read reference 1: History now influences voting. I should note that tye's changes to address the problem don't work 100%, as we still get users who mass-downvote another user, deciding to just suck up the negative consequences from tye's changes. tye also said "administrative intervention sucks" but I have no problem manually intervening to address the corner cases.