Can you imagine the alternate headline of "US sends peace keeping force to Saudi Arabia to protect African migrants"? That's a sociopolitical minefield if there ever was one. I'm sure that if the US knew, so did most everyone else, and there weren't any other countries lining up to help. SA isn't known for being a clandestine government, more of a "What are you gonna do about it, buy more oil?" kind of operation. The US is damned if we do, damned if we don't. Step in and its Team America World Police, don't do anything and we are standing by letting genocidal governments kill nations.