What's the big, huge deal? How is this such an affront to one's dignity?
It's well documented that there are people out there trying to do serious, deadly harm to us.
It's also well documented that things like this are a waste of time and the scanners don't work very well.
My concern is that we continue to spend time, attention, and $$$ on things that are not core security issues.
Why would I need to hide stuff on/in my person when I'm allowed multiple carry-on bags that get 1/5 of the attention/scrutiny or when I can buy most of the "banned" checkpoint items in the airport shops?
People are Fed-exing bombs and trying to plant them in dogs and we are spending money to take away nail clippers that you can buy 1 minute/100 feet after passing through security.
Each scanner machine costs 100-200K just to purchase and install. Add in repair, maintenance, and staffing and you could easily have 8 humans doing that job instead - and who can be retrained if situations change.