Huh? If a real terrorist wouldn't act like that, then how could the air marshalls have shot him for acting like a terrorist?
Ask Kevin. He is the one who claims that if someone acts like we would expect a terrorist to act, it is evidence that he isn't a terrorist because a real terrorist wouldn't act like we'd expect him to. Of course, according to Kevin, someone who
doesn't act like we would expect a terrorist isn't a terrorist, either, so it might make it slightly difficult to find someone who's a terrorist.
Quite apart from everything else, this "a terrorist knows we know he will act like a terrorist, so he won't act like one" has the slight problem of infinite regress. For if, as Kevin claims, someone shouting "I have a bomb" is evidence that he
isn't a terrorist because a
real terrorist wouldn't act this way, then all a real terrorist have to do is to shout "I have a bomb" and we would wrongly think he isn't one, wouldn't we?
It's like the scene in a satirical play I have forgotten:
JOURNALIST: They know your code.
AMERICAN GENERAL: We know; we pretend to have not been aware of it, in order to fool them by feeding them false information.
JOURNALIST: They know you know their code.
RUSSIAN GENERAL: We know; we pretend to believe the information that we get from their code, to make them unaware we know they know.
JOURNALIST: They know you know they know your code.
AMERICAN GENERAL: Yes, we know that. They think they have us fooled, don't they, into thinking they believe what we tell them?
JOURNALIST: They know you know they know you know...
RUSSIAN GENERAL (deeply worried): Really? Are you sure?!