Oh, such outrage, that was unexpected. Anyway, looking at the US as a state and asking what they care about this and is it enough to deal with spending money, time, risking their people's lives, and so on is pretty fair. Especially as we were talking about some hypothetical US strike to end Boko Haram forever, rather than trying to rescue the girls and then just leaving under a banner. And Not like I am saying the girls don't matter or it's not bad (but I guess that needs mentioning).
Bruce already provided two answers, I am not too sure about one of them, myself, but eh.