Why do you suppose the Trump campaign has spent an inordinate amount of time having propaganda splashed all over the front of rag mags seen in dang near every grocery store line in America and enlisting trolls (both foreign and domestic) all over social media portraying his political opponents (and even members of their families) as being involved in criminal activity... up to and including the assassination of John F. Kennedy?

HINT: For the exact same reason the Trump campaign filed dozens of cases all over America spreading the absolute bullshit propaganda and lies that Donald Trump had won an election when they knew damn well he'd lost. Because the propaganda bullshit absolutely does work on a subset of Americans in the same way that factual evidence and policy goals moves a whole other subset of Americans who won't vote for a (perceived or actual) criminal to represent the United States.

A candidate doesn't need to change anyone's mind about for whom they will cast a vote... just whether or not they'll even vote at all. Add to that the fact that Republican legislatures all over America have made it harder for Americans to exercise their right to vote and the standard operational procedures of gerrymandering packing and cracking across the United States wherein candidates choose their voters instead of the voters choosing their candidates, but I digress.

I know a lot of Democrats (and quite a few Republicans, for that matter) who would have root canals in every tooth before they would cast a vote for Donald Trump and will either happily or reluctantly cast a vote for Joe Biden, but I can also easily think of a few scenarios wherein many of them would refuse to cast a vote at all... and that could make all the difference.