If, say at 18, your government gave you a gun for your birthday and enough ammo to make it through the 100 lessons, on how to use and take care of that gun, the lessons being a service that also came with your gun.
Now your government makes it mandatory that you keep the gun, ware it at all times on your person and know how to us it.
This is the best measure against crime. When you make guns illegal, only criminals have guns.
If every citizen had a gun and knew how to use it, less people would commit violent crimes. Because they know the person they are facing has a gun and knows how to use it.
Also it ensures that in the case of a war, every citizen can defend both themselves and their country.
With continued classes given at a discounted rate, it would ensure the safety of everyone