The fact that we let the Taliban carve out their own country in Afghanistan led to Sep 11. The fact that we've let Daesh do the same thing in parts of Iraq and Syria has led to the events of the past few weeks. I doubt they will stop there.
No nation wants to solve this problem alone (although the Kurds are doing a hell of a job considering). The permanent five members of the UN Security Council have a "primary responsibility for maintaining international peace and security". If they wanted to, they have the capability to put together a coalition force of overwhelming superiority that would flush these turds out pretty quick. Even the Chinese have had a wake up call for crying out loud. But don't hold your breath.