I don't see any clear articulation of the dangers, other than that he's a convicted criminal, which I argue is for purely political reasons. Republican candidates have been labeled "HITLER 2" since Goldwater. I'm not cheerleading, but rather am trying to make policy arguments that add as much value as possible.
Can you explain why his conviction is relevant? As it stands, the facts are that it was for hush-money paid to Stormy Daniels, but it's clearly viewed as political by voters. I would agree that it was a grave matter if his felony were an unrelated murder or something, but that's not the situation, and again, voters are not stupid.