So, the risk from a backscatter radiation machine is roughly equal to the risk from terrorism. The Federal Government, via the FDA, tells us that the risk of the backscatter machine is "minuscule". Therefore, in the Federal government's own risk terminology, the risk from terrorism is "miniscule". Why are we spending all this money on a "miniscule" threat? Why are sexually molesting the population over a "miniscule"…
There are companies that are selling these things are and are making fistfuls of money, some of which goes right back into political campaigns etc. In other countries that would be called corruption. In the USA, it's legal.
Think about it - why does the government go on to spend huge amounts of money and piss everyone off? Was there a cause that means we now suddenly need these sensors and groping procedures? Was there a terrorist attack that I missed? Were there politicians campaigning for this who then got elected - I guess I missed that too?!
Kids can certainly forget about putting on sunscreen now, as you're way more likely to get skin cancer from the airport. Either that or they get sexually molested.
The terrorists have very clearly won right now.