Shouldn't the same privacy logic apply even more to your laptops and personal electronic devices when you're entering U.S. borders? Having these people search your hard drive is an invasion of privacy.
What is it that they think this policy stops, anyway? If I wanted to import illegal electrons into the US, I'd just put them on a nice server right here in terrorist Europe, go to the US with a clean OS installation, and pull it encrypted over the intertubes.
Many engineers have toyed with the [space cannon] concept, but nobody has came up with an actual project that may work. Hunter's idea is simple: Build a cannon near the equator, submerged in the ocean, hooked to a floating rig...A system like this will cut launch costs from $5,000 per pound to only $250 per pound. It won't launch people into space because of the excessive acceleration, but those guys at the ISS can use it to order pizza and real ice cream.
Though it won't work on people, with launch costs that low, who cares?
We warn the reader in advance that the proof presented here depends on a clever but highly unmotivated trick. -- Howard Anton, "Elementary Linear Algebra"