More accurate to say "people are selfish" if you want slightly less charged language. The common sentiment I hear is "I was doing better in 2020 than I was in 2024" and that was all the impotous to make people vote "not Biden".

That mindset makes sense on a surface level. So it's not stupidity. But the lack of introspection on if Biden made things worse or simply stopped things from getting much much worse was definitely not taken into account.

I'd personally call it stupidity. But it doesn't mean people are stupid overall.