I agree. It seems the main purpose of having a thread is to update on latest news, list latest trades and act as a trading block. The rabble rousing every time someone makes a player available is unnecessary. If you don't like a player, you don't have to say something about it. If you do, feel free to make an offer privately. But the behavior has submarined threads in the past and it's not healthy.
Also I'd say the majority of the time, the person making the negative public comments is privately trying to acquire the player... So there's a bit of gamesmanship involved usually... Trash the guy you want publicly to try to drive down the price. But obviously it's caused larger problems in the past so it should come to an end.
I'll fully admit I was guilty of this in the past. Eja had made Chandler Parsons available. I publicly made comments about his injury, because I wanted Chandler Parsons. It was gamesmanship. I get the gamemanship aspect, but in light of what's happened, it should probably end. It just forces the GM to go into defensive mode to salvage the public value of his player... and that causes a domino effect.