Where I draw the line is with tariffs being used to protect inefficient industries.
All industries are inefficient if they are not manned with what is essentially slave labor as they are in China.
The UAW is the opposite end to slave labor?
Not to mention the fact that in China and many other countries, you have state-subsidized industries that can afford to sell goods barely above (and sometimes below) production costs thanks to those subsidies. Additionally, industries in the developing world don't have to worry about pollution regulations - they can just dump their industrial waste raw, wherever they please.
The bottom line is that unless the US wants to convert its economy to a system of de facto slave labor, state owned/funded industry, and an environment of toxic air, water, and soil, imposing tariffs on the manufactured goods of China and other "developing" economies is the most reasonable way to account for our own overhead costs and level the playing field.