I have wondered the same thing.
I remember the president of a small aerospace firm calling Rush about trying to hire the local high school grads. He was willing to pay them a good starting wage and to train them, but these graduates’ skill sets of reading, writing, simple math, and communications were so poor he couldn’t use them unless he did a lot of remedial training to boot. Not surprising, the local high school grads were NOT interested in working for a living doing “factory work”. Most of his hires were from outside the local labor pool.