An astounding number of young people pose a real danger to the public, at the drop of a hat. Many of us recently saw an online video of a young teenage girl brandishing a knife, large enough to be a deadly weapon, attempting to stab another young girl. Just in the nick of time, a police officer shot the attacker, who died. While this is the most extreme video I've seen, there are many other instances of similar behavior, mostly unrecorded by media. SNIP Bear in mind that the military learned a long time ago that training a combat infantryman...