just some thoughts on dc naval yard shooting:
having worked 30+ years for defense dept. i can say with some authority that there are very few that are totally civilized. most have had thoughts at one time or other of inflicting some sort of pain upon co-workers and others. many own guns and will talk about them. one associate made his own bullets because they were "better than purchased ones". another while hunting heard a bullet go over his head; he turned immediately and shot back. but these people as far as i know controlled their feelings. being a jerk is merely par for the course.
going into restricted areas can be done by waiting for someone to enter or exit and catching the door and going in. exit points can be entered and entry points can be exited. there is no fail proof system. entering and moving around without proper documentation (bumper stickers or badges) is possible. i will deny all of these if questioned - who me?
sooooo, a total defense against the myriad of dangerous people among us is probably impossible.
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senior, old age, second childhood, sickness and death, ain't we got fun.