On the IMHO side of things:
Sanders drops out just after the Wisconsin primary where his supporters had to risk Covid to go out and vote for him. And that was probably the main group thinking they needed to take the risk. Total facepalm.
This is more about politics than the coronavirus, but perhaps you mean to condemn Sanders, in which case this is better for the Pit. Given this, I’m closing it. You may reopen it in different forum.