When you get punched in the face, the first thought is not who else got punched. Of course ppl will vote based on their own recent face punching. "I didn't get punched in the face when the other guy was president"
I wouldn't say stupid, I'd say ignorant. A more progressive interpretation: you can't help someone else until you have your own mask on. People are voting based on how they feel their life is compared to 4 years ago and apparently half of america very much recalls life being better then. They don't feel the need to dig any deeper than that; they need to get their own oxygen mask on.
Which is a bit of a weird argument because people did get punched hard in 2020. Things were mostly very bad during Trump’s last year in office. Jobs were lost, millions died; Trump himself spent days in intensive care in October 2020.
Political memories are very short. Trump can get excused for the botched Covid response because it’s ancient history, but Biden can’t get excused for global inflation which followed from the same disaster.