That is what caused 911, dummy.
Fear means nothing to people with suicidal ambitions. You cannot scare suicidal maniacs away.
They had aims and hope for the future , even if they wern't going into the future.
I don't think they were unreasoned , they thought us cowardly and that acts of courage would amaze and cow us.
They probly still think this way , they don't repeat our storys of heroism any more than we credit them with reason.