Fish,
Having extensive experience shooting pistols, rifles, and shotguns in a high stress environment (competitive cowboy action shooting), I agree with a lot of what you say in an environment where the target is less than ten to fifteen feet away (which is probably true in most home environments). But if your target is beyond that distance, the pistol becomes much easier to accurately aim and hit your target with a lethal shot while under stress than the shotgun. This comes from experience in timed shooting competitions where you have to hit targets the size of a dinner plate at anywhere from 10 to 50 feet in a certain order as quickly as you can, firing off multiple rounds at different targets in a prescribed order. Every round that misses its target is a point loss. I have found that I am generally much more accurate with a single action revolver than with the shotgun in these high stress competitions. I know for a fact that I am even more accurate with the Glock than I am with my Ruger revolvers.
Also, because you pretty much have to use both arms to shoot the shotgun, you cannot easily hide behind cover (such as a wall) and effectively shoot at someone else. With a pistol, it is easier to reach around cover and aim and shoot while still keeping most of your body protected somewhat from oncoming fire. And I promise you, someone getting hit with one of my high-power .45 cal. hollow points will not keep coming. It is not the same as a .25 cal. or 9mm. It packs a serious punch and the impact alone will put someone on the ground. Pistols are just as easily kept track of and locked away from children. You can get a biometric fingerprint safe that will fit in a bedside table.
Again, I am not disagreeing with everything you are saying. Just clarifying my own opinions on the matter. I'll stick with the Glock for home protection, thanks just the same. But if I need it, the 12 gauge isn't far from reach. :devil: