There's also the factor that those coal jobs are GONE. Even with increased demand if the Trump Administration is able to really push that through, automation and changes in mining mean that all those jobs as coal miners aren't coming back, and the people who were told that they are coming back were simply lied to.
Coal gets a lot of attention because it's visible, distinctive, and I think a lot of people see it as a stand-in for any blue-collar job, i.e. the stuff that's all being automated or obsoleted out of existence.
