These invasive measures need to stop.
So they think it's safe, without years of studies on effect. They'll pose the alternatives of it being implied that you must be up to no good if you don't consent to being bombared with radiation.
If we dont' all grow large warts over ourselves, they'll increase the frequency of these scans, eventually it's likely we'll all be scanned multiple times just to enter an airport and board a plane, get off again, then repeat for the return trip home. Who are millions of people going to sue if this turns out to not be so safe? Which airline will be able to cough up millions per person for millions of people?
Yeah, you can be pat down instead, but we can be reasonably sure the lazy bastards doing it would rather be on their bums, will make the experience such that you'd prefer to be scanned next time instead.
Some things just aren't worth the one shot in a million a terrorist might slip through some checkpoint. Inch by inch we crawl towards a militant state, and won't be able to turn back beyond a certain point. They only get away with it because the dead don't tell any tales, your grandfather won't be able to speak about the freedoms he had that you don't once he is gone.
Paris, because our generation gets internet porn in exchange.