I've been pondering this quite a bit. After 9/11, I went on a flight (something I do very infrequently) about a year later and nearly missed my flight in spite of being nearly two hours early for the flight due to the increased security (and ironing/smoothing out those new processes). 10 years later, I get on a flight, and the process is the same as it was then, still much more intrusive than pre-9/11, but the system has realized inefficiencies and worked through those to create a better way of creating the same level of increased security while also being mindful of travelers' time. Not a single one of us has thought twice about ensuring we're at the airport an hour minimum before our flights to make sure we get through security. A tragedy happened, regulations to provide security to the nation were changed immediately, and society adjusted. No one cried about any rights being taken away, and anyone who has attempted to use "more intrusive" search techniques as a free pass to commit criminal acts upon travelers has been severely punished. We've seen a change in regulation work in providing increased security for the nation while admittedly making things more intrusive in the common traveler's life. When the nation sees those liberties as worthwhile to the security of the nation, things can be done. Until that point, we're waiting on a 9/11 accomplished with guns before anything can truly happen.