But how many of us will ever be in that sort of situation?
Yes, of course one would like to be prepared should the need arise. But if you look at the statistics, your life (or someone else's) is much more likely to be saved by your ukemi skills or your defensive driving skills.
Statistics is irrelevant to an individual: the ideal is to be happy while being prepared and demonstrating to others how to do that, always. The purpose of a martial art is to train the mind with sincere realistic training, rather then the comfortable compliant training thus limiting a dojo into a moving-yoga-tumbling-social-club. Training joyfully with tough training forms the mind to handle all challenges, in all aspects of life.