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Much to say here, but the most glaring miss here I think is this:
losing capital or jobs to subsidized rivals also curtails economic freedom
Jobs don't have to exist; if a subsidized rival produces things below cost, you (in your role as a consumer) get things for free/at steep discount. That's not different than them having a comparative advantage in producing it.
Let them.
And free up the labor for other things. (Yes, I take your point about manufacturing->service and different types of skills etc — but shouldn't your point be to loosen trade regulations/restrictions/obstacles or — if you're keen on using gov force/money — finance trade schools/renewed education for now unemployed steel workers?)