I happen to agree with the OP, and have practiced the same thing on a daily basis for about 45 years now. If youre going to bother carrying a gun, it should be the one you shoot best with, and have the best chance of prevailing with, in as many situations as possible.
Look at it this way, that boy in the recent mall shooting, was "just at the mall", with no expectation of being in a bad area, or scary place, and if all he had had, was an LCP, or one of the other currently popular pocket handguns, that so many seem to think are sufficient as a primary gun, I seriously doubt, things would have turned out as they did.
The whole point here is, bad things happen everywhere, and at any given moment, and not generally on "your schedule". When you need a gun, you need the best gun you can carry with you, ALL the time. Not just when you think you might have some trouble.
These days, I live in what most would consider a very safe, very rural area, and I still carry a Glock 17, all day, every day. Its no different than anything else I carry with me every day either, nor have any of the other, usually full size handguns Ive always carried in the past. And most of the time I was carrying, I was doing so in NPE's, and wearing everyday clothes, and nothing out of the ordinary or out of place for where I was.
In the 15 years or so now that we have lived where we are now, there have been a number of fairly high profile type murders and assaults within a 30 to 45 minute drive of where we live. One was 400 yards from our house (one of three of our closest neighbors). Dont for a minute believe, that bad things cant happen, even if you live in what you think are good places. When you need that gun, you need it, and you need it NOW, and it had best be the gun you shoot regularly with, in realistic practice, and you'd better be as best as you can be with it to boot.
Just out of curiosity, how many here would be able to do what that boy at the mall did, 8 hits out of 10 rounds at around 40 yards, with the gun you have on you right this minute? And you do have a gun on you right this minute, right?