How are they missing this by such a big margin. Smaller cartridges or banning sniper scopes will not solve anything.
Maybe they are thinking the other options, like investing in children, in psycho care, changing this bad ass culture you have there is no more an option and searching and changing the problems why there are such people and why they went down this road are no more viable option, so they go around offering trivial new laws just so it would appear they are "on it" and working very hard to salve this problem.