Even in the Balkans, when it was just the Serbs and Croats going at it, nobody cared, but once the Muslim Bosnians got into the action, then suddenly everybody cared about what was going on over there.
You might want to ask Bob Dole and John McCain about that.
Along with Bill Clinton, of course...
Nobody cared enough to intervene in a more or less fair fight between Catholics and Orthodox.
Once largely defenseless Muslims were being slaughtered and images of concentration camps looking like Nazi concentration camps got to the US and the rest of the world Clinton cared enough to threaten the Croats into submission and bomb the Serbs. Turkey was not going to stand pat forever as their kinsmen were slaughtered.
Dead Arabs effect the price of Oil whether the corpses lay on oil fields or not.
Dead sub-Saharan black Africans do not whether Christian Muslim or animist.
Both criteria need to be met to intervene. It has to be the right thing to do to protect native populations and it has to be in our national self interest.