It’s part of their Gaia religion. It is a mystery that must not be questioned.
A key to victory for Trump is to separate members of old time industrial unions from the Democratic party. This presents a real opportunity to do just that. Doesn’t have to be limited to UMW - the EPA does it to all sorts of construction trades, steelworkers, etc.
And he can simultaneously attack government unions using the VA scandal. Split the union vote into two warring factions and he has a chance in the Midwest and PA.
When Hitlery “misspoke” and took herself out of context, mebbe she intended instead to break into song:
“I’m proud to see the coalminers slaughter...”
Seriously, that's a side of the question that I honestly begin to find a bit disturbing.