(Even so, it does make sense as well to tighten down the borders and ports of entry and to deport illegals from suspect middle-eastern countries. Those are reasonable approaches regardless of the true severity of the situation.)
But eventually, scaremongering can become destructive -- see the ridiculous level the anthrax scare has gotten to, with people who don't need to take antibiotics taking them and hording them.
If there truly were as many terrorists and cells and supporters as this report claims, they would already have the ability to section off a chunk of our territory as a beach-head! I doubt that all they'd be able to do is send a handful of letters with anthrax to a few high-profile targets. That's the tactic of a relatively few remaining "disrupters" on the run.
You lefties don't get it do you.
Terrorists don't have beach-heads.
Their weapon of choice is surreptition, infiltration and faceless action.