Coal is dead. ... trying to resurrect something ... dying [from] market forces ... is [perjorative].
This isn't about trying to resuscitate the coal industry (though if it lets it run a little longer and die more smoothly - rather than being suddenly assassinated in a fit of political vitrual-signaling - it will let the miners and their offspring migrate to other jobs, rather than to government assistance.)
It's about killing off the massive, expensive, and intrusive regulatory infrastructure that no longer serves any purpose.
If Big Coal IS being killed by market forces, the government needn't bother killing it off.
It also gives Trump the opportunity to keep a promise to some of his voting base, make political appearances claiming credit for it, and engage in some virtual-signaling of his own (conservative style).
Remember: He didn't promise to bring their jobs back (though if some of the jobs do come back, or existing ones not be ended as soon, it is a bonus). He promised to dismantle the regulations that had already killed jobs - and give a dose of job-killing medicine to the regulators.
I suspect schadenfreud will please his coal-state voters, and the prospect of voter revolts and sweeping reforms may make at least a few future regulators think twice before stomping jackbooted on the faces of those they regulate.