I think there may be some exceptions on certain specific situations. It all has to do with reasonable expectation of privacy. I don't think a security checkpoint is such a place where a reasonable expectation exists. Could be something that varies from jurisdiction to jurisdiction. Could be as simple as posting signs advising that audio recording is taking place.

Be that as it may, I agree that it would be more beneficial to playback audio-video to find out what really happened, who said what, etc.