NRA's Eddie Eagle program doesn't teach kids how to become expert marksmen behind their parents' backs. It teaches kids that guns are dangerous, and if one is found, it teaches them to treat it as dangerous, to notify their parents or another adult, etc...
Pretending that guns don't exist, or that a child will never encounter one is, in my view, more akin to practicing abstinence to prevent unwanted pregnancies. Sure, it's a means to an end, and in a vacuum, abstinence is very, very effective... but when we realize that we're not living in a vacuum, and that the world we live in has guns in it, as well as people with which you might be sexually attracted, in both cases, education is a much more effective tool than unrealistic optimism.
Both my kids (8 and 11) have their own rifles, and we shoot regularly. If my kids want to shoot or handle a certain gun, I let them do it under supervision with no reservations.
If you're about to point out that social, economic and political conditions are very different in Switzerland and Ukraine, you're probably on to something. Murder rates of various countries do correlate with several measures of social, economic and political stability, but not with gun ownership.
Secondly the fact that A=>B doesn't mean that also C=>B so you should expect high B when either A or C is true.
(Read => as implies, causes or correlates with - it doesn't really matter).
Buying ammunition from a gun store appears to be an option for anyone with any of several types of gun license.
"You can't stop planes and tanks with a rifle, therefore the Second Amendment is useless!"
Small arms seemed to work just fine in Vietnam and Afghanistan.