One 1992 telephone survey estimated that American civilians use guns in self-defense up to 2.5 million times every year – that is, about 1% of American adults have defended themselves with firearms. Now, 34% of these cases were in burglaries, giving us 845,000 burglaries stymied by gun owners. But in 1992, there were only 1.3 million burglaries committed while someone was at home. Two thirds of these occurred while the homeowners were asleep and were discovered only after the burglar had left. That leaves 430,000 burglaries involving homeowners who were at home and awake to confront the burglar – 845,000 of which, we are led to believe, were stymied by gun-toting residents.
This is not unlike what I discovered when I heard the claim that someone prevented a crime with a legal gun every 13 seconds.
86,400 seconds/day * 365 days = 31,536,000
31,536,000 / 13 = 2,425,846.15 crimes interdicted by a gun.
Trouble is, when you look up crime stats at the DoJ, you can't find that many violent/property crimes, let along a number larger than that. And as in the example, you need that to make it work: you can't have a sample that's larger than your universe.
Being skeptical is not disrespectful or wrong: it just means you want to understand the facts rather than repeat a lie.
This book would probably be fascinating and maddening by turns, based on the examples chosen.