You need to take an exclusion approach. Most passengers on US air flights have clearly established records. If you can take the majority of people out of the current overkill security theatre, that means they can go through standard-level security queues quickly (note no one is proposing dropping security here). I dread standing in the densely packed security lines at DIA. A single suicide bomber could kill several hundred people on a busy day there without ever passing a security checkpoint (as the author points out this is now the bigger risk). If you can reduce the number of people who need to remove shoes, liquids and have back-scatter and pat-downs to a small minority, then everyone will be safer. I'm a libertarian (in the Jefferson sense). But I agree to reasonable security checks voluntarily by choosing to fly. But invasion of privacy has gone too far when someone makes me walk through a Dick Measuring Machine or is "meeting resistance" for the sake of public relations theatre.