Those Romans also had a saying (which I can not quote in Latin 'cos I'm only semi educated) "Test not those you trust the most."
I was taught that it meant that one should always check on those one trusted so they were never tempted. Seems like a sound principle in today's times if we are going to have this rigmarole every time we fly.
They don't actually need security at Nashville any terrorist going through there is going to die of the airport food long before he can do any damage.