If we implemented protectionist laws we would be in worse shape. It would throw us into a depression due to the resulting evisceration of trade. But in the long run we would be better off. You need protectionist tariffs to offset the wage discrepancy...
You are right to point out the interconnection between wage laws and protectionist tariffs but there are over-arching strategic factors which all governments must consider.
Take steel as an example (good article in Wall Street Journal, 15-3-2015).
Since January 2014 Chinese steel exports have increased by 63%. Chinese steel makers are mostly state controlled. This surge in quality steel supply is crippling US and EU steel producers. Hot-rolled US coil has suffered an 18% drop in price. Good news if you want to buy some but a problem for producers in high wage economies who see their profits cut to nothing.
Now, in a world of perpetual peace and harmony, such as these boards, this would not matter a jot. But in our real world of actual and imminent conflicts, no nation dare let its defence industry become dependent solely on imports or 'dumped' sub-cost steels.
"Dear China, please could we have some more of your steel plate, we want to build another aircraft carrier because your actions in the South China Sea are making us nervous".
Because the above sentence is obviously unutterable, tariffs are imposed and local essential industries are thus protected, whatever the wage-rate differentials might be.