Why or why not. Discuss.
In the OP, you list five points that seem to support the use of a 22 handgun or carbine for HD. I'll address them one by one, using a 9mm pistol or 5.56 carbine as the rebuttal firearm. I'll also be granting and/or penalizing points to the 22 as necessary. We'll start it off at zero and see where we end up.
1) Typical home defense distances are the distances that most people plink at with .22LR: 7-15 yards
I agree, but I don't see the relevance. If your goal is to choose a firearm that "most people" could use effectively, then the 22LR is a good choice. If your goal is to choose a firearm that is reliable, effective, and simple to use, a 22LR has quickly been reduced to a terrible choice:
- High-quality rimfire ammo is notoriously unreliable even compared to the lowest quality centerfire ammunition. Minus 1.
- Given the biological mechanics of threat elimination, and the importance of wound diameter and penetration therein, 22LR is about the worst caliber choice for quickly/effectively stopping a threat (given it's relatively low energy and small bullet diameter). Minus 1.
- You would have a very difficult time explaining how/why a 22LR pistol or carbine is easier to use (in terms of function) than a comparable firearm chambered in 9mm. That makes this point moot, so we'll call it neutral/zero.
2) Easy and cheap to train spouses/older children on a small caliber
Based on recoil and muzzle report, I'll give you this one. Suppressing a pistol or carbine, while being an effective option, is both expensive and time-consuming.
Plus 1.
3) Little concern with over penetration on "miss" targets
This one is moot, given the numerous options in bullet designs in popular HD calibers (namely in 5.56) designed to eliminate over-penetration.
Neutral/Zero.
4) Low sound and flash for night time indoor shooting
This is addressed in point #2. Since it's redundant, it's
neutral/zero.
5) Large magazine capacity and ease of follow up shots
The capacity thing is a toss-up. Popular 22 pistols (specifically the offerings from Browning and Ruger) have ~10-round capacity, which is less than typical duty-sized centerfire pistols. Popular 22 rifles (the Marlin 60 and Ruger 10/22) have capacities ranging from 10-25 rounds. The 10-rd 10/22 magazine comes with the rifle and is great, but obviously has marginal capacity. The 25-rd 10/22 mags are notoriously unreliable. The tube-fed Marlin 60 (14 rounds, btw) is ridiculous to reload - it's not even an option.
As for the
ease of follow-up shots bit, I agree, but this is assuming ammo reliability. It also ignores the training possibility for rapid follow-up shots with a centerfire pistol or carbine. Since training is accounted for in point #2, this is also redundant.
Neutral/Zero.
Looks like the overall score for a 22 is -1. Guess that's a no.