Austerity is not unknown to Europeans...How much pain do you think we can really take? As pampered as the last few generations have been.....I'd not bet on too much.
Let's try it this way.
Why Europeans or Japanese or Koreans are not buying American cars?
They do, sometimes, and when that happens, they pay heavy tariffs on our cars. Why would they buy, due to the tariffs, more expensive American car, if they could buy their own product much cheaper? The tariffs are obviously working in their favor, since our product isn't selling there.
At the same time, they can sell their cars in United States almost completely free of tariffs and compete against our product in our own market. And since we allow it, it's good for them.
I agree, putting tariffs on foreign product will raise prices on their products and make them less competitive to ours. If their cars become more expensive, what do you think Americans will buy?
If you account this above, the question is not: "How much pain do you think we can really take?", rather how much pain they can really take?
What will happen if Americans stop buying foreign cars? They will buy domestic. We have an industry that can fill that hole in fairly short time. Can they afford selling millions of cars less annually?
What will happen if Germans or Japanese stop buying our cars? Is really gonna hurt us if they buy 20000 or even 50000 cars less annually?
Second example, NAFTA eliminated "nearly all barriers" of Mexico and Canada selling their products in the US without tariffs, and allowing them to tariff our products at will and that's what they've been doing since then. As I said earlier, Trump tariffs are message to them that it's time to level the playing field in one of the two goals: a) putting tariffs on their products until they lower theirs, b) eliminating all tariffs.
Why do you think they don't agree to neither one?
Because they love their deal under NAFTA, that is favoring them, not us. It's time to correct that. Being allies and friends should go both ways, it's time to treat them the same way they treat us. Leveling the playing field is not bad idea. Not at all.