It would obviously be incredibly stupid and horrific for people to elect Trump and Vance. But many Americans are incredibly stupid and "throw the bums out" is their solution to everything.
And it's absolutely no help that Democrats have turned a blind eye to the cost of living crisis because "line go up" for the older, white, affluent, and conservative voters they're after. The DNC broadcast that very loudly.
And that's not the only way Democrats are alienating their core base of support.