Public Humiliation? How? I have been singled out several times and have seen many other pax singled out too. I have once been called off the plane to the jet way to have my documents checked. I have never felt humiliated or considered others undergoing extra checks as humiliated. I often out of curiosity ask why I was singled out and get varied answer but I never feel bad about it, and if anything feel reassured that someone is doing their job. I don't know your nationality, but certainly non-US nationals see a fair share of 'singling out' when flying from overseas airports to the US.

When people are called aside for further checks it gives me reassurance that the system is working as it should. Remember that some of these checks are intentionally random - so why should they be seen as humiliating? Maybe with more singling out at the gate - be it targeted or random - some breaches in airline security, some of which have major consequence, could have been avoided.