Well, to be fair, it isn't just because we don't like the other guy, it's because we REALLY don't like the other guy. Mostly because we feel he's unfit to be president, and would be a danger to the country if he's in charge.
Well, it was clear he's 80, and not as quick as he used to be. Beyond that lies little more than speculation and opinion.
Such as?
Third party votes are right out, as they'd be effectively votes for Trump. If President Biden chooses to step down, it'd be up to the DNC delegates to determine the party's candidate, so that's unknown. In the unlikely event the 25th Amendment is enacted, then we're left with Vice President Kamala Harris as Acting President. If that's the way things go, I'm fine with it, and will have no problem voting for her.
But until and unless that happens, if Biden is on the ticket, he's still a better choice than Trump, no matter what.
-- A2SG, to my mind, Trump is far, far less mentally (and psychologically) fit to be running the most powerful country in the world.....