It has been done

You choose to ignore the data

Mass stabbing do happen here or here or here or here or here or here or here or here, the list goes on


The research has been done here, here, here, here, and this list goes on.

St. Louis University Public Law Review
Concludes there are at least 400,000 "fewer violent crimes due to civilian self-defense use of guns" and at least "800,000 violent crimes are deterred each year because of gun ownership and use by civilians."