This is the candidate's job. She didn't center a coherent vision of the improved future only she could get the country to. Pick one thing that Trump wouldn't or couldn't run on, that wasn't just "getting back thing we lost (under our watch)." Green New Deal. Medicare For All. Defund the police. Build houses for everyone. Monorail. Anything for people to hang a hope on. But any big idea would piss off donor-investors who would be hurt by any change to the status quo. So she offered nothing.
So the default is to vote for a person who will run the world into the ground? I don't understand why the onus on the sane person to prove why they're going to make things better. I guess people think that any change is good change? Yet people voted Hitler into power.
My take is that America was founded during a time of very high "mental activity" and engagement. In the 1700s people read for fun, the printing press just having been invented the prior century; and listened to candidates debate for hours, at a level of complexity that is beyond people today. A democracy takes that kind of mental energy and engagement to sustain. The citizens of the US seem to be too complacent, too uncaring, to uneducated to preserve their freedom, and so they won't keep it. Sad to see.
The default is not to vote.