No, that stunt was reprehensible.
It’s not a stunt. Carson was going home and leaving the campaign trail during a critical 0eriod in the race. That is almost always a sign of a candidate about to suspend their campaign. CNN reported it and Cruz’supporters supporters made sure that Caucus goers knew about the CNN report. It would have been malpractice if the Cruz supporters didn’t make sure that everyone knew about the breaking news story.