47% of votes went to Trump. I don't think 47% of American voters are coal miners. Focusing on them seems exaggerated.
Clinton lost Pennsylvania, West Virginia, Michigan, the entire damn south (aside from New Mexico), etc. etc.
If Clinton had slightly better showing with manufacturing-based southerners or the energy sector, she would have won.
Clinton lost because she wasn't able to get out her base in Wisconsin, Michigan, and Pennsylvania.
If Trump lost Texas you wouldn't be talking about how he failed to reach voters in Washington.