It’s because dropping out is 100% not in Trump’s character. He’s in the race for himself, everyone - even his supporters - knows that, and asking him to drop out is like asking a zebra to try all-black.
Biden, OTOH, is a public servant and presents himself as trying to do the best things possible for the country. He ran in 2020 to ‘save us from Trump,’ and he’s running again with that premise. You can disagree with Biden on what is best for the country, and maybe convince him that someone else might be better able to beat Trump in 2024. I’m not really all that engaged, so I have no idea who the next-best Democrat would be, but Biden stepping aside is at least within the realm of conceivable possibilities.
I was listening to some pretentious film critic yesterday complain that modern films have stopped being artistic or intellectually challenging, because there’s a huge audience of people who are exhausted all the time. They don’t want media that makes them think, that challenges their assumptions, or even requires their full, sustained attention. Comfort media, like mac & cheese for the brain.
Fallout has become exactly that - some vague, nefarious organization as antagonist; raiders & feral ghouls as unambiguously bad cannon fodder. Just move it to a new city, put in some iconic landmarks, and let the money roll in. I can’t honestly think of a franchise that gets past 2 without falling into that trap, but I just started another run through FO4.