I find it remarkable that over the past 200 years, the discussion has remained basically the same and the players have switched sides.
In the early 1800s, the cost of living in the US was much lower than that of Europe, and so goods and such were much less costly to produce. In the late 1800s, the reverse was true. In the early 1900s, the tables once again reversed, mostly due to the World Wars and factors such as the Great Depression, which started in Europe much sooner than in the United States.
In the late 20th century, tables turned again, and now European and Asian products produced in those countries are cheaper.
All the while, trade tariffs, taxes, and other import/export mechanisms have been used to offset the reduced cost of foreign goods.
The main difference in this debate is whether or not Airbus is recieving subsidies and do those subsidies constitute a violation of the 1992 agreement?
I believe that any subsidy of any business, excepting those cases such as the post 9/11 airline bailout, is a violation of the role of government. Government contracts for services rendered is one thing, but grants and/or loans to give a business a comptetitive edge are wrong.
Don not misunderstand me: I believe that both Boeing and Airbus have recieved support that they should not have recieved. However, as an American, I can say that I see Europe as more Socialist than the United States, and so I say that I believe that Airbus probably is in violation of the agreement.
So do I support tariffs? No. However, I see no other alternative for the protection of American jobs, save Airbus losing its support subsidies.
And finally, the use of political pressure on foreign governments to purchase the products of a particular nation is as common in Europe as it is anywhere else. To say that the United States acted untoward in its pressure on Taiwan is ludicrous. England acted in much the same way in its "Triangle Trade" practices of the late 18th century, and even now, France calls for dropping sanctions against Iraq because of their losses in trade with that nation. Every nation acts in its own interest, even those that claim to be acting for the better good of the world. Sometimes they are, sometimes not. Often, it depends on perspective.
Those who fail to learn history are doomed to repeat it in summer school.