Not having any guns also has in all cases nobody getting shot.
But in the US, you need a gun for self-defence because of the potential that you're assailant will also have a gun.
I'm not suggesting banning all guns, even if in my opinion that would be the better option, but to add limits on the sale of guns through licencing, background checks and the like.
RE: Reality Check: Trump Did Not Make It Easier for Severely Mentally Ill People To Buy Guns