I was going to post the exact same thing.
We have two choices. Choice one is to arm the Kurds. ISIS would be pushed back. Towns would be freed, and many innocent lives would be saved.
Choice two is to ignore the Kurds, and let innocents suffer while ISIS expands. But that would offend people who don't like us anyway (the Turks, the Iranians, and the corrupt gang in Baghdad).
The politically easy, and cowardly, choice is choice two. So that's what the US will do.
Another choice would be to arm Christian militias. But muslims forbid that, so that's why we don't do it.