Self-defense is not about fighting. It’s about surviving. That’s why we call ourselves survivors, not fighters. Or victims.
Even so, one must still prepare for battle. Self-defense is 90% caution and 10% confrontation. As Mr. Miyagi says, we learn to fight so that we don’t have to. The more prepared we are, the less likely it is that it will come to that. Better to be safe than sorry.