All the guns in the world won’t help us if they’re locked in gun safes. Carry is the operative word here.
The common sense thing is to keep them off our soil and secure our borders. That is most effective. Guns can give you a fighting chance against a Paris style attack, but they do nothing to protect from other means of attack such as IED’s, sabotage, arson, etc.
An overwhelming percentage of our casualties in the sandbox were from IED’s against very well armed troops to include suicide vests. Very difficult to defend against - see history of terror in Israel.