It could be taught in preschools along with simple things like basic gun safety, swimming pool safety, and how to avoid perverts. Unfortunately all of these things are educational luxuries for the rare kid with parents that take the time to teach them to their kids. It seems like intelligent people could put together a laundry list of simple, easy-to-teach things along these lines that could be taught in schools for very little money.
Depends on the location. In Japan it's a waste of time and resources, in US it can save lives.
I was field stripping and re-assembling AKM in school (just like everyone else in the class), on the clock, under watchful eye of a real war veteran. And shooting .22 rifles in school's basement. Not a big deal. Admittedly we were older than 5 years, but not by much.
