I would take much less issue with the TSA and its personnel going beyond their expected scope of work if they performed their primary function with a high degree of accuracy, consistency and - dare I say - courtesy. Too much anecdotal evidence here suggests otherwise happens frequently.

I'm a systems engineer. I implement and maintain large web applications for a commercial bank. In my current role, I work exclusively with Windows based servers. If I'm doing this poorly, I should not be lending a hand to support the Unix teams, the security and intrusion detection people or anyone else. It's beyond the scope of what I'm supposed to do and unless I am completing my own job with a high degree of efficiency, I have no business attempting to go outside of that scope.