When we where at Yellowstone recently we carried bear spray everywhere. I don't think it was paranoid because (1) we always have bear spray in the car anyways in the roadside assistance kit and (2) National Parts are probably the most likely place to have a human-bear interaction because the bears are concentrated and bold.
One of the east-coast tourists noticed during dinner and we got to talking. I explained the "whoa bear" concept, the spray's effectiveness, etc. He asked what would happen if the words and spray failed... Would I use "harsh words?" I said that I would probably prefer to use "large caliber words" at that point of affairs. This got an uncomfortable facial reaction and rapid change of subject.