In his last four games, Jared Sullinger has scored 5, 5, 0, and 5 points on a combined 6-31 shooting (19.4%).
Now, I don't think he should be benched, but if Jeff Green had put up those numbers, you'd have posters saying to give James Young a shot. If Avery Bradley did that, you'd have multiple threads clamoring to free Marcus Smart. (I wouldn't want to bench Green or Bradley if they had a run of bad games, either, because I'm not a SVG-level master of panic.)
I don't think the Celtics have to trade Sullinger, but he's not a definite piece of the puzzle. He's never going to be good enough to be the best player on a contender. He probably won't be good enough to be the third-best player on a contender. I don't really see him ever being an All-Star. Honestly, I don't think it is a lock that a healthy Sullinger will be a NBA starter five years from now. I'm not sure he'll be worth the contract that he will get when he reaches free agency.
I just think posters give Sullinger more benefit of the doubt than they give to other players. Why are people unfair in that regard?