Acrochik
I don't think those types of technology are the answer in an airport but I'd agree with you about 'highly trained people able to make rational decisions under pressure' It should be remembered that the airport security itself is the last line of defence and extra resources are probably better spent on security procedures before a passenger arrives for travel.
That said it's also worth looking at airport security from a different perspective. Both checkin and BAA security focus on items and not people, these staff members don't really have security expertise nor do they have a remit or the training to profile people or their behaviour (going back to the El Al comments) When in an airport the only person you are likely to encounter with any behavioural expertise is at Passport Control, and he's focused on an entirely different aspect of security.