What scares me is the faceless machine nobody cares about silently collecting naked pictures of every citizen, managed by people nobody will ever see who can never be held accountable for anything. You can't simply flip a switch and capture high fidelity copies of a pat-down search. You can with the machines.
Incidentally: contrary to popular opinion, security agents, law enforcement, border control, &c all very much do care when complaints are filed on them. Their M.O. is that nobody takes the time to file those complaints. They're counting on people not bothering with the pat-down because the machine seems more convenient, and they're counting on not dealing with a flood of complaints. I plan on filing a complaint at the first hint of an off-color comment about what they're doing. "Better get new gloves, Fred!" --- "I'd like your name and your supervisor's name, now."