It was open season on American military and diplomatic personnel during the 90s. There was no price to pay for killing Americans.
Your belief is my belief, that terrorism will stop when the terrorists realize that no matter where and no matter how hard, someday an American Soldier or Marine, perhaps both, will kick in their door and kill them. Afgahnistan and Iraq were demonstrations that we can and will do it.
They have no survival instincts or reflexes and suffer from dear-headlight syndrome. Seriously.