"For every instance of a gun used in self defense: 11 commit or attempt suicide; 7 use a gun for criminal assault or homicide; & 4 are injured or killed accidently, usually children or teens." https://www.safety.com/firearms-in-the-home-safe-or-dangerous/
Not to mention that self defense doesn't happen nearly as much as the gun lobby claims it does. "'The researchers who look at [Kleck's study] say this is just bad science,' Hemenway says. 'It's a well-known problem in epidemiology that if something's a rare event, and you just try to ask how many people have done this, you will get incredible overestimates.' In fact, Cook told The Washington Post that the percentage of people who told Kleck they used a gun in self-defense is similar to the percentage of Americans who said they were abducted by aliens." https://www.npr.org/2018/04/13/602143823/how-often-do-people-use-guns-in-self-defense