Total crap because they only consider homicides to be "usage". The overwhelming majority of defensive uses of firearms the trigger is never pulled. Bad guys, amazingly enough, don't like to get shot.
For those usages, wouldn't a toy gun work just as well?
Right up till the bad guy figures you're a paper tiger and he pounds you to death. So...no.
Justifiable homicides with a fire arm account for 250 instances a year. Literal one in a million events. You're about two and a half times more likely to be struck by lighting.
I personally know two people who have used handguns for self defense.
Both were white guys attacked by multiple black guys.
Both were able to deter violence/further violence by merely showing their handguns.
OF course they didn't fire their guns. THey didn't kill any of their attackers.
So, according to your slanted stats, nothing happened and they don't exist.
Except that if they did not have those guns, they would have at least been badly beaten.