Sanders is one old and tired guy, someone who's done literally the most to push the left forward in America in recent years. Acknowledging that he's giving up and getting nothing in return for it is fine - it's the truth. (Though burning all bridges and going out in a blaze of Democrat-denouncing glory may close future paths for young Berniecrats, so maybe him going quietly at least legitimizes him in the eyes of Democratic voters.) But throwing invective against him is misdirected anger. He can only do so much. Let him rest and take care of his heart. Make sure youngings like AOC don't slide backward instead.