It looks like to me some of the arguments made above are more of the "turn the other cheek" nature and that seems to point to not to say anything to someone who has done wrong and just shut up. We are not the ultimate "judge" in the big picture, but we are to correct a brother who is in sin, if, (and it's a big if), we have our own house in order.
Christ was not timid when it came to correcting and trying to save sinners (which we all have in common, sinning that is).