The people in those regions you mentioned are largely conservative. By that measure, isn't their issue with the Free-Market system which they prostrate themselves at the altar of? Conservatives also cite laws as being something that should be left up to the states. And they say that marginalized groups should simply move if they don't like the laws of the state they are in. So isn't the system working as they desired since people are leaving places they don't find suitable?
The function of both parties is to convince their constituents to believe in policies against their own interests.
As someone not steeped in it, I think the charitable interpretation is that these people like working a job for the dignity of supporting themselves. The jobs went away, but the desire for that dignity hasn't. So social welfare policies remain uninteresting. In fact any top-down analysis sets off their "government handout" detectors, so they're left pining for the age before the need for labor dried up.
IMO a lot could have been done (and perhaps could still be) by decreasing the definition of full time work. With technological progress, offshoring, and women entering the workforce, full time employment should be around 10-15 hours per week. It's a radical departure from the status quo, but that's due to progress being held back so long. Instead we're stuck between a rock and a hard place with an economy tuned to force people into working 40+ hours a week, but little actual work to do.
(BTW the work in cities is more about communication, so the same trend manifests itself as the creation of non-producing bullshit jobs. There is less financial pain, but similar existential pain)
It never is and never has been. But that doesn't stop people from invoking it in modern society repeatedly. And I would argue that people leaving these economically dead zones IS representative of labor meeting capital in terms of mobility.
They were union and democrat, and when the jobs left, they looked for someone to blame. I think most people can agree it's a complicated situation. But a lot of them really, really hate NAFTA and there's a reason for the post-Clinton shifts in the midwest. At this point, you have people stewing in partisan radio or tv all day. It takes a very strong person to resist that influence. Most of us wouldn't.
Almost everyone just wants to be safe, happy, economically secure, and the same for their kids. That transcends nationality, religion, or party. I think trying to frame it around economic policy reversed the way the mindset was bootstrapped.