Muslims whether arab or otherwise have been murdering Chrstians by the millions since they started their imperialistic trek from arabia over 1300 years ago.
Our concern for the "Black" non Arab Muslims is well intentioned but where is the outrage when Christians of any racial stripe get massacred by Muslims?
In southern Sudan, where the population is (or at least was) Christian and animist, the death toll is somewhere under 2 million.
Yes, we should decry genocide anywhere. Yes, the U.S. should lead the as much of the world as will be lead into action. Oh, and yes, I agree with you, it should have been done many times before now.