In mitigation spotting done by experts (preferably Israeli trained .......) could provide an additional and reliable level of security. It is certainly far from stupid or pointless.
I understand why people may object - we're all different - but I'm for it and will cooperate with humour and helpfulness so long as the approach is courteous and completed by trained people and not BAA staff.
I find it reassuring.
How do you know they are 'experts' or 'trained' ? I don't know whether the UK has a similar requirement for a
reasonable and articulable suspicion before a police officer, even special branch, can accost a citizen. Probably not, and there is always the infamous section 44 stop, but that legally does not require the subject to identify his/herself.
It certainly seems like a fishing expedition to me unless OP resembled a wanted individual, or has skin of a particular shade.
I would not find such an interrogation the least bit reassuring. Boiling frog syndrome.