All of my points were related. Anything is a weapon if you put it in the hands of someone with intent or lack of knowledge. We have too much of both.
The weapon/tool hasnt fundamentally changed. The AR series of platforms, beyond your scary AR-15 didnt make any real revolutionary changes from what was otherwise available. Maybe the failure button, forward assists for the AR bois out there, but I am honestly not versed enough to know for sure. Large capacity mags were a thing. Semi auto was a thing. "Military style" was a thing, and you could find them all in one package. Maybe the use of 5.56 which would be specifc to the 15. But i would think there were other manufacturers with their own pre-AR-15 models of rifles with 5.56. So again nothing really changed with the guns.
Gun access has only gone down, with ownership dropping too, until recently. But with the amount of times i get flagged at the range now i am not so sure that's an improvement. But that goes back to my point of people not being raised on how to use a gun.
Taking away guns, limiting access or sales, should be the absolute last resort. Not the first, and only, card that gets played. If you want to convince pro 2A people that there is no other choice, you need to show your other body of work that has otherwise failed, go over all the options, and how you ended up at restricting or limiting the 2A. You may not see it as such, but to the people who are pro 2A you are.