K.B.
I don't think the lack of armed officers at the airport is due to the US being too nice or too fair. It's about not living in a police state. We don't live in a dictatorship where you could be carted off by an uniform at a moment's notice, we have due process and protection under the law.
I heard a program on NPR the other day talking about airport security and how much of it is theater (just for show) and they referenced the Israeli system. What's admirable about their system is not that there are gunman everywhere, but that the people conducting security are highly trained in behavior and profiles (not stereotypes, but that people hiding something would act a certain way).