I read this article, and I think it's nonsense, and probably penned by a guy whose last pistol was a cap-gun.
The premise of the article is that big bullets result in big statistics, and smaller bullets mean smaller statistics.
Well, here's the fly in the ointment. Ever hear of a group of handgun enthusiasts called "The Mafia"? They use cheap .22LRs almost exclusively for hits.
To that, if I do not sell my Kimber .45 ACP, I'm going to install the .22LR conversion kit. I'm in the most danger in urban settings. I want to have the bullets stay in the body of the attacker. Here's my take: Practice, practice, practice!
If you use a heavy caliber at close range, and it perforates the attacker only to hit an innocent bystander, you have major legal problems.
I believe in this concept, and I have converted to carrying a SW 642 and a P238. If you cannot protect yourself and family with handguns like that, you should just revert to a baseball bat...
Heck, I'd go to Joyce's Schrade!