Both can be true. A large swath of the electorate is stupid for electing Trump, but the Democratic party failed to reach them. This is a lesson that Republicans have known for decades but Democrats still don’t get. Voter’s are not rational; being better than your opponent does not win elections. People can be annoyed at the voters for making this reality, and at the Democrats for still not getting it.
In fairness to the Dems though, the incumbent party lost ground in almost every Democracy, and Harris underperformed less in swing states where both parties campaigned.
In what way is Argentina inconsistent with MMT?