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In my opinion, it is simply watching pornographic pictures during work hours for the screeners, the travellers unwillingly making pornographic pictures, and child pornography for minors travelling. MAJOR privacy issue here peoples.
I disagree.
First of all, nudity and porn are two different things.
Second, I have shocking news for everyone worried about their "privacy": roughly 50% of humans have a penis, the other 50% have a vagina. They all look about the same. If you think yours is special in any way, you are being silly. If you think the airport screener, who probably has seen a thousand of each on his X-ray machine just that morning, before you walked through it, is even going to give a second thought to yours -- you are being silly.
Obsessive shyness (as well as failure to differentiate between nudity and sexual situations) is a very recent phenomenon and it is not helping make the world a better place. Get over it.
Other than that, I think these machines are a great idea and far more useful than most of the idiotic airport security measures to date. The notion that offensive weapons must be made of metal is about 40 years obsolete; today, we have plastic and ceramic materials to build an excellent assault rifle without using a single metal part. Metal-free firearms are not mass produced and may be hard to obtain, but an effetive ceramic blade of any size could be easily made in somebody's garage.