At what cost though? I've heard this protectionist argument from a friend of mine many times before, and it always ends up circling back to his current employer, who if there had been larger economic/regulatory barriers in his industry a decade and change or so ago, would likely not exist.

Protectionism has its place, but we should fully evaluate the cost, damage and benefits created by protectionist policies before implementing them, otherwise you end up with massively subsidized US corn crushing our NAFTA partner's agriculture industry, and Chinese Steel being dumped on the US at significantly lower prices than the US Steel industry can produce said metal at (mostly due to Chinese state subsidies, just like our agribusiness subsidies).