The coal people should blame their own industry. They didn't adapt to the natural gas and alternative energy booms, and now they're dead. They might have been able to survive if they'd diversified or at least changed to focus on export. Too late now, coal is a technological dinosaur and the literal portrait of an environmental disaster.
The problems in West Virginia and similar places go a lot further than just coal though. It's pretty much macro forces acting on brittle communities. A lot of these places had one industry, and once it folded, they were dead. You see places called "LastName's Mill", and then you drive by the old shuttered mill factory and the story of why the town is dead are pretty transparent. Urbanization didn't help either.
I have no idea if there's a solution short of waiting for everyone in those communities to resettle or die out. Certainly Trump doesn't have any answers. Why would anyone want to move there or start a business there? They're the exact opposite of the young, vibrant, diverse communities that thrive these days.