I think that carrying while backpacking, in most cases, is silly. That pound could go towards something that is more likely to save your life.
However, there are places where, if you are someone who regularly carries, that it would not be silly to continue carrying. The places Jennifer describes are a good example. Some of the areas in Northern California that are more accessible by old roads, not deep in wilderness areas, can be a little sketchy with all the pot farming out there. Not dangerous enough to not go there but enough that it makes sense to extend your carry into these places.
There are some really lightweight pocket pistols that could be effective as a short range last option weapon.
One of my backpacking/camping buddies is an LEO and he carries a ruger LCP in his pant pocket.
You know that at one time carrying a pistol was a womanly thing to do? A pistol is a force equalizer against large men with more brute strength.

