They wanna keep making crappy cars without pressure.

A legitimate concern is that if a manufacturer is able to use under market cost labour to produce a product 30-40% cheaper than the cost using unionized labour, people will prefer that vastly more affordable product. If I could buy a car for $15k instead of $40k, the decision is easy, and I would probably give up the transit pass too. Especially in a car centric society like USA.

On the other hand, high profit margins are a weakness that should be exploited.

Korean cars in Korea are made with robots or precision arms. There is almost 0 human labour involved. It's the factories in US, Euterpe, etc. that use mostly human labour due to pressures in creating local jobs. As matter of fact, when the Korean companies sold their Chinese factories (for extremely cheap), that's when the Chinese learned to use robots for them as well. Chinese cars have almost no human labour as well.