Well, there was one friend of mine who I convinced to keep a fire extinguisher in her car, and a week later on her commute she was able to hand it to man who then saved his car from total destruction by engine fire.

But I too also know more people who've been threatened with lethal force on the streets than have had reason to use fire extinguishers. Doesn't deter me from keeping a big fire extinguisher wherever I live.