"they're using pre-paid phones because: 1) they've used them successfully in Iraq for quite some time...they know that formula. 2) they can be in california and detonate a bomb in NY."
And banning cellphones means they would have to adjust.
"theory is great. reality is better."
And reality is, considering all the possibilities.
yep, and adjusting takes time...time we can use to our advantage.
and after considering all the possibilities, establishing priorities and tackling the biggest/most-probable, not putting most of ones efforts behind the lowest return.