Okay so I read some of your edits and I see many holes in your arguments about not allowing everyone to own guns.
That being said, I cannot deny that societies that have restricted firearms ownership across the board have less homicides.
The factor that no one considers is that those societies are mostly homogenous, whereas the USA is not only more diverse than all countries combined, it’s also difficult to secure due to the size. Pandora’s box was opened long ago and it’s too fucking late to disarm the entire population.