I'm not making a moral case that America should police the seas, but simply pointing out the practical reality that the US Navy actually does control them, and

I'm not making a moral case that America should police the seas, but simply pointing out the practical reality that the US Navy actually does control them, and hence we're the natural party to propose and also enforce any agreement. The truth is that if the US does nothing, mass fishery collapse is the most probable outcome. It will hurt poor, seafood-consuming nations much more than it hurts the US. Is this more important than any of our other priorities? That's up for you to decide.