Threatening to Leave

Iran's flawed strategy to close the straits. Anyone who's ever dealt with a crazy partner knows crazy doesn't work for long. You threaten crazy shit, and the partner backs down the first time. But then they realize, wait...I don't need to deal with this shit and call the bluff. The crazy person might do the crazy shit, but by doing so, lose all leverage. 

We, the US, could sit on our hands and say, fine...keep the straits closed. Who says it's our responsibility to keep it open?