Terrible to read about this. The tragedy of poor Yazidis is even worse. Much as we all like to hate America, they are the only ones willing to act against ISIS in any meaningful way. Not China. Not Russia. For that, despite all their real and imagined sins, we all should be grateful.
While it is unfair to paint an entire religion/culture with the same brush, Arabs/Muslims need introspection on why monsters such as ISIS and Boko Haram are able to find a fertile soil to spread their message in their societies, get volunteers by the thousand and control territory. Obviously, they have local support in areas where they operate - no group/army can control a large area without local help or conduct murder/kidnappings at this scale. How are they able to hijack a religion for their evil purposes? So many Arab countries spend billions and billions of dollars on buying the latest defence kit - why are they not bombing ISIS and sending troops/tanks against them? Given the physical proximity, it would be easy for them to act against ISIS - this can be an opportunity for Arab states to show that they stand against terrorists and are willing to act against them - all of humanity would be supporting them. I hope they are up to it and act!