You need to look harder then. A CDC study showed an estimated 500,000 "defensive gun use cases" per year in the US alone. I will caveat that though with the fact that those results were based on a combination of police reports and general surveying of people without verifying the truthfulness of their responses. They also loosely defined "defensive gun use" to include scaring off an attacker by threatening the use of a firearm, whether or not the potential victim actually had a firearm to use. And I don't remember, but I believe the study also counted cases where guns were used defensively against animals as well, which would inflate the number quite a bit.
I found
a Forbes article that references a 2013 CDC study, which may be what you're thinking of, and
a Reason article.
Actual uses of a gun for self-defense aren't quite what I was referring to, although that information may be interesting in itself. Rather, what I was getting at was the gun owner's justification for owning the gun, and whether it was rational and/or reasonable, given the risks. Simply put, the decision to use a gun doesn't justify itself, and other peoples' decisions to use their guns doesn't justify anyone else using theirs, so data on gun use doesn't justify gun use. Of course, it's hard to measure risk objectively. We can find extreme examples of times when the use of a gun was clearly justifiable and others where it clearly wasn't. But those are few and far between, with probably hundreds of thousands of incidents in between.
The
Forbes article quotes the
Reason article: "However interesting attempts to estimate the inherently uncountable social phenomenon of innocent DGUs (while remembering that defensive gun use generally does not mean defensive gun firing, indeed it likely only means that less than a quarter of the time), when it comes to public policy, no individual’s right to armed self-defense should be up for grabs merely because a social scientist isn’t convinced a satisfyingly large enough number of other Americans have defended themselves with a gun."
I agree with this, although maybe not for the same reason that the authors had in mind.
Reason provides the wording of the CDC survey question: "During the last 12 months, have you confronted another person with a firearm, even if you did not fire it, to protect yourself, your property, or someone else?" (so that excludes the animal encounters) and notes that the CDC survey "asked no follow-up questions regarding the specific nature of the DGU (defensive gun use) incident." So that data would include any incidents where the use of a gun we would all agree was unjustifiable. I'm thinking, as one example, of the guy who shot the kid in a gas station parking lot; the guy said he felt threatened, and was rightfully convicted and sentenced for murder and attempted murder. If that guy was
so scared by three teenagers playing loud music, then he wasn't capable of handling a gun responsibly in the first place. The guy in Florida who killed someone in a fight over a parking space is going on trial this Summer, I believe, and the guy in Detroit who killed the young woman on his porch is serving 17 years for manslaughter. Like I say, incidences this (relatively) clear-cut are rare. I can name these 3, which is basically nothing in the larger picture, but the point is that all three of these murderous morons, if surveyed from their prison cells, would go into that CDC survey as a DGU.
As for guns used for deterrence, the fact that nobody was actually shot doesn't justify it after the fact, either (and we still can't assume that the use of the gun - even just to brandish it - was justifiable). The fact that hundreds of thousands or millions of guns are used every year in the name of self-defense only tells us how gun-happy and/or scared we are.