Problem is, Airport Security Screeners are a nosy bunch and more than one has flipped through my passport and asked questions about my international travels. Being nonresponsive to this game all too often results in a retaliatory in depth inspection of my carry-on and a grope. I know from other pax that many people have the same experience.
One needs to be prepared . . . metal spring clips and rubber bands seem to do a good job of limiting their curiousity.
That said, the whole ID thing is silly . . . the Airport Security Screeners never check ones name against any kind of data base during the checkpoint process. Plus, who cares about another passenger's ID if the screening process for weapons and harmful substances really worked.