Disputed if this picture is real, but it doesn’t matter, it’ll be the iconic picture.
Obviously it makes him more likely to be elected. Obviously you can’t call someone Hitler and a fascist and a threat to everything good without an increased chance for violence. If he is Hitler reborn, after all, killing him would be the right thing to do.
Blame will be apportioned, whether rightly or wrongly, and it increases the chance and amount of violence and repression down the line when and if Trump becomes President.
I don’t, personally, care much except as regards the consequences. I wouldn’t care if Trump or Biden was killed, not for them, anyway. They’re both mass murderers and Trump has spent the last nine months going on about how much he supports the Gaza genocide.
That said, I wouldn’t kill either myself or advise anyone to assassinate them, as it is counter-productive. Both of them are symptoms, not causes, and if Trump had been killed whoever replaced him would have been as bad or worse and likely won on a sympathy/vengeance surge.
America’s problems aren’t about any individual. If only it were so.