Back when I was certified as an official in several sports, I learned a lot about the games, and about human nature. An official has three basic responsibilities in any sport; Safety, consistent and objective application of the Rules, and to encourage Sportsmanship. Usually, the aspect of Sportsmanship was the easiest to enforce, because most school districts and sports associations also pursue this ideal with great energy. There were two occasions however, when Sportsmanship was tested and sometimes gave way to bitterness; on very close contests of importance, and when the game was a blow-out.
In fact, the worst offenses of poor sportsmanship happened in the blow-outs. In close contests, the comptetitors were aware that the penalty for a foul could be the deciding factor in the game, so there was a natural deterrent to avoid commiting a personal foul. When a game was clearly out of reach, however, the losing team often felt they had nothing to lose by "sending a message", even if that foul was serious enough to merit expulsion from the game and a heavy penalty on the team. That seems to be what is going on right now with the Democratic Party.
I have been trying to sort out the logic behind many of the words and actions taken by leading Democrats. It occurs to me now, that the Democrats consider the present race out of their control, and they have resorted to trying to get in any shot they can, even if it means living by the cheap shot.