Fear. Put yourself in the shoes of a 50-year-old coal miner who's had the same job since he was age 18. You lose your job, and the town in which you live is starting to decline because the major source of money is gone. You have no idea how your going to pay for your bills and food.
Do you really think such a person is going to be enthusiastic for retraining for a new, competing with younger people, and moving? Or do you think this person would rather support politicians who promise to restore the coal mining industry?