You’re kind of making my point for me, my friend. If training is important and not being culturally supported on an individual basis because that somehow equates with “liberty” to not have to learn how to be responsible then the only sensible, practical, reasonable thing to do is to require it. The only other option would be to somehow change the culture to help people want to be radically self-responsible again, but the current climate seems to be that “freedom” is also the freedom to be irresponsible if you want to. “You can’t tell me to wear a mask in public, even though doing so might keep me from infecting and killing someone else….”
“My rights end where yours begin” is ostensibly a Libertarian/Conservative sentiment, but a certain percentage of the people who identify that way seem to now believe that “My rights are whatever I want them to be, and I have no responsibility to anyone.” Calling that out is kind of the theme of this OP, in an indirect way.
Note: This conversation is not about access to guns; it’s about proper training and understanding of how to handle the ones you do have access to so what happened at Ft. Hood is neither here nor there in this context.