It's more invasive than necessary and doesn't work any better than metal detectors. Why should the default position be "they're not that bad"? Any search at all

It's more invasive than necessary and doesn't work any better than metal detectors. Why should the default position be "they're not that bad"? Any search at all I'm not thrilled with and the metal detector is about the extent of what I'm willing to permit as 'reasonable' without suspicion and without a warrant.