I do this sort of thing for a living in IT; yes, no lives are affecetd but this is an issue of risk/reward that just so happens to be one of personal privacy as well. I'm willing to dismiss the personal privacy portion of it and address it purely on risk/reward.
What they NFL patdowns do are the equivelent of spending a lot of money to secure yourself against one specific threat instead of creating a global solution that minimizes risk against multiple different attacks. Let's look at a home security solution. Let's say you buy a 24" thick solid steel door with 14 locks, no glass, and an electric doorknob that shocks and kills anyone who touches it while the alarm is set. This door costs $50,000.
Unfortunately, your side door is a rotting peice of wood, you have a broken basement window, and there's a patio door with a broken lock. Instead of spending the money to make all of your entrances more secure, you focused on one specific threat -- the front door -- to the exclusion of all others.
Maybe I'm not making my point very clear (I'm going on 2 hours sleep due to said job...), so it's entirely possible...
CW