I count myself as one of those Democrats, and no, it wasn't a matter of "losing my nerve", that performance was just that bad. In 2020 you could tell he was an old man, but he still had it. 2024 Biden was a marked deterioration.
The real blame is on Biden for not realizing he simply didn't have it anymore, and for the rest of the party for not convincing him to stick to his one-term promise in the first place. If we had a full Primary we may or may not have had Harris as the candidate, but whoever won would have been in a much better position.
Donald Trump doesn't give a fuck about the future. He only cares about himself. And while it's taking his sweet time about it, he is aware that his meat sack will eventually rot away, so he can't waste time.
He doesn't care about making the world a safer place for his children, and their children. He wants people to respect and fear him, now! The military is an extension of his tiny hands, and he's letting us know he can grab us all by the pussy, because when you're the President they let you do it.