Why not tax the negative factors then, rather than the country of origin? i.e. If the price is supposed to be a lever for labor conditions, why just tax China

Why not tax the negative factors then, rather than the country of origin? i.e. If the price is supposed to be a lever for labor conditions, why just tax China heavily and not Bangladesh? Why tax more fuel-efficient European cars instead of American-Built Jeep Grand Cherokees? And if reducing plastic waste is the priority, why would Trump's day include unbanning plastic straws? Answer: It's not actually about reducing negative externalities, it's about geopolitics, otherwise it wouldn't be so negatively weighted towards a single actor.