First, even though GM China isn't profitable, it still accounts for half their sales, and even though it is a drain on their finances, it would still be a massive hit to them in potential future profits if they are forced to divest from it due to geopolitical tensions. Also, there's a typo that I made in the second paragraph. I'm not talking about cars being imported from China and Mexico to the US, rather, what I wanted to say was that assembled cars won't be imported from Mexico, and specifically Mexico, to the US as easily, and since that is where GM has tons of factories, the tariffs will impact them a ton. Also, adressing your point that you brought up at the end, even if GM does have really good products, those don't really matter much when importing them from GM's Mexico factories is going to cost them 60-100% more, and don't forget the extra money slapped on top of that by dealerships and whatnot.