'The labor market will reallocate to productive jobs' doesn't take into account the experience of having ones income security disappear as an industry is shipped overseas, then having to retrain into a new field.

And the US largely didn't fund that, at least in a meaningful, at scale, don't-piss-people-off way.

Those at the top reaped the benefits of free trade; those at the bottom suffered the pain.

Trump (the character) was voted in on the basis of that anger, something the Democrats never seemed to understand.

It'll be curious what the reaction is to serious economic pain in the midterms.