Los Angeles Times 9-15-2014 has a front page feature article on the assistance Iran is providing, particularly to the Kurds, in the battle against the Islamic State.

You see, Iran is mostly Shiite, and one of the central objectives of the Islamic State is to slaughter Shiites.

Of course, everyone must always remember, "My enemy's enemy is my enemy's enemy, nothing more" (Schlock Mercenary).