The numbers regarding defensive gun use is very likely to end up being a classic example of commercial interests affect scientific research. Nearly all of the high numbers come from a handful of sources that have connections with the firearm industry. There are many methodology problems with their numbers too.

In the relatively small amount of research on this subject that is not influenced by commercial interests, the numbers suggest that defensive gun use is very rare: https://www.sciencedirect.com/science/article/abs/pii/S00917...