> Wait until you realize that the EU tariff on American cars has been 4x the US tariff in EU cars for awhile.

That's a simplification beyond what's truthful. Import taxes are different on different types of cars, both in the EU and the US. There's certainly some type of car where the above is true, maybe some type of gas guzzling pickup truck or something, but over the total amount of sold cars it is not. Trade-weighted differences simply aren't that great, which is not a coincidence because a) both the US and the EU are developed economies which are likely to benefit from free trade, b) taxation works in nudging the market what to buy which evens out the differences further, and c) we have had trade agreements where this was an explicit goal.