It turns out that the suspect in the Times Square terrorist attempt spent six months in Pakistan.
Naturally, we can't "profile".
But . . . if you spend six months in Pakistan, and it's not to stay with a sick relative, or visit a newborn grandchild, or because you just retired and want to "go home" for a few months, you should be profiled, stopped and watched.
Generally, only Paris Hilton or terrorists in training can afford to take off six months from work to visit another country.