The whole 9/11 thing was always out of whack in the first place. They got way OVER ANAL about EVERYTHING. I hate to say this but the terrorist actually won. They accomplished alot of damage beyond the twin towers. The whole TSA thing is a joke. SWAT, POLICE, FBI all wrapped into one wannabees. This system created a POST OFFICE EMPLOYEE style enviroment in the airport. They virtually have a license to treat the public like crap with no recourse.
Another thing too. If these machines break down, do you really think they'll stop the flow of luggage coming through? What you don't know can't hurt you at least 99.9 percent of the time.