It's not stupidity, it was a clear option between something the American people know does not work, and something that might work.
If the Biden/Harris status quo continued, beyond the genocide and other awfulness, the median American would die from COVID or other such disease at their desk at work in their 80s while still stressing about how 2/3rds their 5 figure paycheck goes to rent and 1/3rd goes to their 1200 kcal/day diet.
Maybe Trump fixes it, maybe Trump ends it, but that above ever enshittificated scenario does not happen.
It's like making a meth empire when you're diagnosed with stage 4 cancer while poor. Best case scenario is better than the best case scenario in the alternative choices.
Well there is no reasonable expectation that voting for Harris improves anything given her explicit statement she's going to be just Biden in a wig.
When you present unreasonable choices, you get unreasonable decisions. To most people Trump isn't the ultra competent, ultra intelligent, ultra evil fascist you guys have been propagandizing him as for the last decade.
He's an incompetent version of a generic politician.