This has such potential for abuse and it's obvious it hasn't been very well thought-out. I hope that in order for an overseer to put the kibosh on a comment he or she will have to enter an explanation. Also, all comments that don't meet the group-think criteria should be viewable by everyone along with who censored it and why. I hate to see another website I love go down the drain.
There is no active censoring; you can only "put the kibosh" on a comment by having several thousand people all independently decide not to click its "endorse" link. Nobody can individually kill a comment.