What's funny is that the scans are not mandatory at the airports I've seen; they only cover half the lines. Just note which line ends in a rape-scan and go to the other ones. They tried to make them mandatory leading up to last Thanksgiving, but so many people were going to opt out that they backed off to avert a PR nightmare. So they still get most of the money, but a real terrorist would just skip the machines.
Without 100% coverage, the machines are useless. But with 100% coverage, people opting out will slow the system to a crawl and they'll have to give up. So they are sticking with an approach which is 100% useless (except to train the slave class to live in fear).