Didn’t they listen to Netanyahu or did they just don’t understand the man. In his speech to the Congress he said that “sometimes the enemy of my enemy is - my enemy!”
The fact that Hezbollah is fighting ISIS does not make them any less interested in terrorizing the West. At the moment they may have their hands full, but remember that the PA (or some of its many sub-groups) sometimes carry out terror attacks againt Israel just because Hamas has done so. Very likely that Hezbollah and ISIS will compete who can cause the worst mayhem for the West.
The administration must have missed that intel briefing. Actually we all need to go into the how-do-we-allow-Iran-to-form-a-caliphate mode and then we will understand the decisions being made in the outhouse. I was surprised when they admitted to leaving 16k of our boots in the stan instead of an all out.
Come to think of it, is Afghanistan on the list? How about Pakistan?