D) They refuse to recognize Israel's right to exist, and keep vowing to wipe it and its citizens off the map. Hopefully it's mostly rhetoric, but... E) Their

D) They refuse to recognize Israel's right to exist, and keep vowing to wipe it and its citizens off the map. Hopefully it's mostly rhetoric, but... E) Their Revolutionary Guard is extremely powerful politically. It's not clear the civilian government is capable of fully reigning in the Revolutionary Guard, and the Revolutionary Guard's political power is propped up by the prospect of war.