Killing one person is murder, killing 100,000 is foreign policy
ISIS are fast-track Nazis. No messing about with a few property restrictions and intermarriage laws as a little light warm-up: They're only in the business of "final solutions", and they start on Day One and don't quit until the last Christian and Yazidi is dead or fled. As I've often remarked about today's exhaustively cleansed Maghreb, Levant and Araby, Islam is king on a field of corpses. But pikers like the Muslim Brotherhood, the Baathists, the House of Saud take their time. ISIS are shooting for the Guinness Book of Records.
Fortunately, progressive opinion in the west hates Jews more than it loves Christians or Yazidi or Shia or Kurds, so ISIS can get on with killing everyone they want to kill.
...you have to pick your causes. To put pressure on Netanyahu, you fly in John Kerry to bore him to death. To put pressure on ISIS would require a commitment the west is not willing to make. So Christians will vanish from the region, and the Yazidi will vanish from the world.
As much as Americans might wish it were so, this is not just a story of one bunch of obscure foreigners sticking it to another bunch of obscure foreigners. It's also a story of a dying superpower betraying its friends in retreat.... You Want Nazis? - Mark Steyn