PA says:
The 45 rules only if well trained and using tactical techniques, but the 223 can be effective using sloppy techniques by anyone. A 45 won't penetrate armor, and a head shot is not always possible. A 223 will penetrate most armor. I don't disagree with you at all on this. I've had a bit of training on all this stuff. Without a lot of training, a .223 in the house is akward.
On the other hand, a .223 OUTSIDE the house is great!
Kit.
PS: although many say the .45 is only good in 'well-trained' hands, I think any pistol used for self-defense should be in 'well trained' hands! Hie thee to the RANGE!!!!
PPS: 'sloppy' handling is a bad thing, no matter what the weapon...
FWIW, the latest ceramic/aluminum body armor plates will stop multiple 223 or 308 rounds point blank. They are typically 12"H X 10"W, and weigh under 5#! Plates which will stop AP rounds only weigh a little more. The technology of hard plates is really advancing, and any SWAT or specops CQB unit may be assumed to be wearing them along with their kevlar.
So folks may need to rethink the old "cener mass" thing in certain situations.