There’s a level of apathy that has been a part of American politics my entire life, the logic is that all politicians do is make promises that they never fulfill and anything said about or by a candidate really doesn’t matter, and it’s treated as an axiom.
Obamas years in office without the Hope and Change we all desperately wanted when he was first elected cemented this in the minds of my millennial peers and it was already pervasive in the older generations.
Not pinning it all on Biden here but his quote from 2020 “nothing will fundamentally change” is very much what i reckon the average American believes. Very few believe anything good or ill could happen here.