That really sucks, to say the least.
My ODA worked out there and we broke bread with those people. They are a good bunch of folks. We had several of them as our gate guards and I don't recall ever having a problem with them.
Sinjar Mountain is definitely a bleak and barren place to try surviving on. It's too bad they don't have water up there to keep them alive because they could have inflicted massive casualties on any IS ground assault stupid enough to try and ascend that rock.