An interesting snippet from the "General Public" version (as opposed to the parent "Internet Cafe" version)
It is important to remember that just
because someone’s speech, actions,
beliefs, appearance, or way of life is
different, it does not mean that he or
she is suspicious. Instead, focus on
behavior and activities that are unusual
or out of place for the situation and that
appear to be suspicious.
The activities outlined on this handout
are by no means all-inclusive but have
been compiled from a review of terrorist
events over several years. Some of the
activities, taken individually, could be
innocent and must be examined by law
enforcement professionals in a larger
context to determine whether there is a
basis to investigate.
It looks like they acknowledge the same individual complaints as noted in the comments here but I think they miss the overall point that people are innocent until proven guilty. It sounds like they are saying only law enforcement professionals are qualified to determine whether someone displaying some of these behaviors is really innocent.
I'm not saying someone needs to have charges pressed against before being investigated. Instead, I'm saying this is a dramatic shift to our social obligations and interactions: the person next to you is now no longer innocent by default, he is a potential terrorist and it is your responsibility to monitor his activities and if they show any unusual behavior to bring in the police/feds.