Why would Israeli supporters be scared of an event that spoke for itself? We had a certain foreign poliy prior to 9/11, are you suggesting that our foreign policy is to be shaped by the demands of terrorists?
Say you have a friend who uses you, sets you up and then eggs you "you are my friend, aren't you gonna help me?" Is that really your friend?
How did Israel set us up? What's more, Israel is not saying "you are my friend, aren't you gonna help me", it's saying "you are my friend, aren't you going to let go of my arms and help me protect myself while I get beat on?"
And as for "friends", there are no friends in foreign policy. The whole characterization of the relationship as such is an emotional blackmail.