It's hard to argue how that link presents the other side of the argument. Government agents (1) were tipped off about Arabic students studying how to fly, but not take off or land, jumbo jets, (2) had an informant living with one of the future 9-11 terrorists, (3) had more than half of the terrorists on their watch lists, but (4) allowed the sale of plane tickets anyway, even though they (5) used their own credit cards (6) in their own names, and (7) some even got extensions of their visas months after dying in the attacks from the INS.
The case against these terrorists was handed to the government on a silver platter multiple times, and they did nothing. This confirms Stossel's views, and hardly supports "the other side of the argument."