Problem is the people who most need the safety class won't take it.
I grew up in a home with no guns, when we visited my uncle the ex-Marine in Kansas he taught us about guns and took us city kids skeet shooting.
I never had any formal gun safety training but needed to take the test to get my first hand gun... I picked up a pamphlet at the local gun store and walked two doors down to the pub for a few beers, after two beers I had finished the pamphlet and said to myself "pfft, this is easy!" and returned to the gun shop (curious what they would think of smelling beer on my breath) and took the test. Checked off the boxes and handed the test back... whoo hoo 100% you pass! Next to me at the counter was a guy who just failed the test.
