This has exactly zero with being left out of economic progress and wanting it. They literally vote for people who are leaving them outside of all subsequent economic progress. And that was also their voting record in the past. What they actually voted for was culture war - disgust with trans specifically and hate toward anything that can be casted as liberal which includes science. It was wish for Christian autocracy and enforcement of associated values.

The feel good explanations are just that - feel good euphemisms. Acting on them failed in the past repeatedly. Politicians who tried to improve situation of these people were punished, repeatedly. Meanwhile, politicians acting in offensive and harmful way were rewarding even when they made lifes of their voters worst.

We really should stop projecting these good faith falsehoods when the are and were clearly false.