After October 1929, many of our banks started failing. Then factories started closing because they couldn't get financing (a liquidity crisis!), and unemployment shot up. Sound familiar yet? Then Germany, which had lost the first world war and hadn't recovered, had similar problems, and ditto for the British Isles and France and Italy. Countries started closing their borders to trade and electing or installing more authoritarian governments. Hitler, the Fascists in Italy, and Communism was about to 'flower' in The Soviet Union. All of which led to WAR. You might remember WWII....
So, no, protectionism may be a very bad idea, even if this downturn is not identical to 1929. BUT, there are enough scary parallels to give one pause. The Ruger stock rise is perhaps one of the most worrisome signs of the times....
-Robert