You want to play defense.. And no one ever won a contest of any kind from war to football on defense.
You win games on offense.
Do you know why we have not been attacked since 911?
You piss President bush off and he defeats your nation. Like Saddam and Osama you end up in a hole or as a murder defendant.
They could get lots of suicide bombers to do it... but the bastards at the top don't want to die. They know that if they do it again, Bush just might nuke em.
But bring the troops home and then the Mullahs will feel safe. They will send in all the suicide bombers they can send .. and all the 100 foot high fences in the world won't protect you.