Stop with the human rights violations against Muslims canard already! Every human group has had its violations. Muslim to Coptic Christians, Muslims to Jews (in Muslim countries), Hutus to Tutses, Communist Chinese to Buddhists, Khmer Rouge in Cambodia to the general population, ad nauseum. Should it be so? Of course not.
As to whom the US (or any country for that matter) backs is a matter of our national interest, not a polite game of whist. Is it always the most moral thing? Probably not. But you do what you have to do for the perceived greater good and hope for the best.
[Gotta go now...supper time; when I return I'll probably be more mellow.]-----John