Not get in the way of their slaughtering unarmed and undefended Christians? It's more than just "killing each other as they're wont to do."
Well, that’s true, but mostly it is Muslims killing other Muslims. The Christians there have had centuries to realize what they were living amongst. While I feel sorry for them but they have had plenty of time to realize what Muslims, historically, are like. They needed to arm and create defensible positions long ago like the Jews have done ... or get out. (PS I have Syrian immigrants in my family tree). It is not hard if you live in the Middle East to figure out how volatile it is. Or you could just read history. EVERYTHING in history of the area points to the same thing that is happening now. The Israelis were smart enough to figure this out (not that it takes a lot of smarts to figure it out)
The Christians there are not a reason for us to get involved ... they tried this tactic in Afghanistan saying we were going to save the women there. Pffft.
It’s the culture.