One worst-case-scenario as you go about your daily business is that someone might try to kill you or your families. Not very likely to happen but it dose happen. Now if you are the sort who likes to be a little prepared for the WCSs when you can and you can carry 30 without burden why wouldn't you? Doesn't turn you into Harry Callahan, just means you have a heavier belt.
Sure. And, frankly, I agree with carrying as much ammo AS YOU PERSONALLY ARE COMFORTABLE WITH. My only problem is when a person is SEEMINGLY looked down upon by some in this thread because of the simple fact that they are comfortable at a lower round count than their detractors are.
I bought a .40 Springer XD a few years back; it came with two 13-round mags and I ended up buying another mag simply because the cheapo mag carrier it came with held two mags. So I would have ended up carrying 40 rounds of .40 cal HP on my belt on a daily basis. I got rid of the XD for several reasons, the main reason was that I was uncomfortable with carrying a pistol without a manual safety. But I certainly don't go around and berate people for liking guns without manual safeties. I am a strong proponent of open carry and often see lots of abuse heaped onto open carriers on THR. I do not berate those who think CC is the only way to carry either.
Right now, as I said, I'm comfortable with 6+1, and I'd feel better with a spare mag (which I don't have at the moment), but 6+1 is better than 0+0, and if I'm attacked by a group of armed robbers and I happen to die during that encounter because I wasn't carrying enough ammo... well, for one thing, how would I ever know? Maybe, just maybe, I should have tied a double knot in my shoelace, then it wouldn't have come undone while I was suddenly confronted by several armed BGs and so I wouldn't have tripped and broke my arm, and I therefore probably should have practiced daily my "shoot with a broken arm" technique in order to have maximized my chances of survival.
Then again, people who remember the quote of "nobody ever complained of ever needing too much ammo" can also remember a second, perhaps less familiar quote: "you can do everything right and still get killed."
The thing is, I've taken precautions that are comfortable to me; I just wish that my choices can be respected in a similar regard to the way I respect others' choices in how they carry.