In the matter of undecided voters, I simply cannot fathom how there can be fence-sitters when it comes to dealing with Donald Trump as a presidential candidate. He is so evil that in my mind this is one of those rare cases of political absolutes in which only those people who share his sick world view could support him, and those with a sense of decency could not. Consider for example Trump's latest campaign obscenity: the displaying of a video on his social media site depicting President Biden hog-tied in the back of a pickup truck. This incident is just the latest in the many instances of his disgusting rhetoric and behavior.
It would be disturbing even if Trump's followers comprised only a lunatic fringe of the American public. But it's a disgrace that millions of voters cast their ballots for him in the last two presidential elections and are prepared to do so again in November notwithstanding one of his few likely genuine promises that if elected, he intends to impose a dictatorship on the U.S. and on the other hand threatens violence if he again loses. Sadly, the more uncivilized Trump's behavior and rhetoric, the greater his popularity not only among his MAGA-head fans but apparently among the electorate as a whole. Otherwise, the race between him and Biden would not be so close as it is at present.
A desirable scenario would be that Trump would not be able to complete his candidacy for whatever reason, such as disability. In particular, his existing condition of dementia could become so pronounced between now and November as to incapacitate him. Of course, the Republicans would have to select a replacement. And I could well be dead wrong, but I would bet that whoever they choose to run instead could not be any worse than the most despicable person that has ever held the nation's highest office.