It's part of TSA's "Start Em Young™" conditioning program. Train the kids from an early age to Respect and Submit to the Authoritah of the blue shirts at the airports. Answer all questions, obey all rules, endure any search. In twenty years a new generation will be grown up to do anything Big Blue Shirted Brother demands of them. Life will then be so much easier for the clerks when only docile sheeple come through the chute. Pavlov would be so proud of the TSA for adopting his methods.