I agree that "2-is-1, 1-is-none" falls flat as a truism, and can sometimes overstate things. Really, do you need to have two bandanas to be sure to have one? Now in the case of fire I can see the need for redundancy.

There are probably places or situations where a second firearm would be a high priority. Yet I would rarely have a 2nd one along. Perhaps if I had a chance to go on a once-in-a-lifetime hunt I'd have a spare rifle along. I do have a CCW permit, and I do carry a sidearm concealed where I can, but I never have a BUG. Considering that many police don't carry a second gun, I probably don't need to. I do carry at least one spare magazine, though.

Any gun can break but when I'm carrying an HK I feel my heart is more likely to fail than my sidearm!