It's better if folks get more training but....this is not an ideal world.
You share the road every day with drunks, meth-heads, innattentive smartphone operators and kids who learned to drive by playing Grand Theft Auto on their Xbox.
They have driver's licenses. Doesn't mean they know how to drive.
(And the ones who no longer have licenses - still drive.)
Near as I can tell, the risk that I'll be killed by one of these licensed drivers is far, far greater than any danger I face from sub-optimum gun handling.