In that case why bother with fire extinguishers, smoke alarms, life boats on ships, first-aid kits, seat belts/airbags, Emergency Rooms, ambulances, fire departments, black-boxes on planes, I could go on. Those are ALL in place for situations that are, statistically, unlikely to arise for any individual. I have, and maintain, smoke alarms in my home, and they've never ONCE sounded during an actual emergency where injury or death of me and/or mine were a possibility. Violent crime in the US is rare overall, and even more rare when you get outside the big cities, but it only has to happen to you once to mess you up.
But I always shun away from fights
Any sensible person does, just like any sensible person shuns car crashes, building fires, etc. Unfortunately the other guy gets a vote too, and if HE decides it's a good idea to pound your head into the ground and rape your wife you have to take that into account. So just like a car crash, you can do EVERYTHING right and still find yourself in one, so best to do your best to survive before hand because afterward is too late.