

The US actually does do that. The issue is that shipping companies do not actually want to risk the life of their crews.
I would have thought somebody would have offered a life chaning sum to some sailors for the journey. That is entirly possible since oil is above $100 barrel and a very large crude carrier can transport 2million barrels of oil or so. So even with a crew of 30, you can still pay everybody a million for the risk and make insane profit, since oil is nearly free inside the Gulf.
Tariffs hit small importers harder. It is a great way to remove competition.