I've made that case to him already, I just didn't mention it here since it didn't seem pertinent to my original question. That being the discussion of how laws and regulations do not solve the problem. It's a social issue, furthermore, he has read my debates with the other individual in the thread I had presented.
He was trying to find ways that might help, I was trying to find more ammunition to defend our rights and show him that this would likely not work, ultimately steering him away from the topic of gun violence all together.
However my OP wasn't addressing this, it was addressing my discussion with him about the possibility of making training more mandatory for firearms owner, and how effective or ineffective it would be.