The reason the US has zero tariffs on nearly all finished goods is that we use trade status as leverage to push various and sundry agenda on foreign nations — bases in Okinawa, drug wars in Mexico and Columbia, "human rights" ... or something ... in China, etc. — not some sacred truth learned from Smoot-Hawley.
Many Western nations have significant tariffs on imports, Germany being the best example. They've had a rigorous trade regime for decades that limits competition with disposable Asian workers and unregulated industry. This is a major reason they still have a healthy working class, a fully funded welfare state and enough disposable wealth to prop up a continent full of deadbeat PIIGS.
But keep chanting Smoot-Hawley if you want. The trade pendulum has swung so far to one side that it has got to swing back the other way at least a little, so you and your fellow Smoot-Hawley chanters are going to lose this argument in the long run. Now that the libtards and their St. Krugman are on the case it's going to be soon too.