First, so what if you do injure your opponent? Assuming of course your opponent has attacked you first. You should not continue attacks yourself if your attacker stops, but while you opponent is attacking you, he deserves whatever he gets imho.
Second, you evidently don't know much about grappling. you can control an attacker by causing pain that doesn't cause actual injury such as dislocating a joint breaking a bone.
What else do you call self defense? I would prefer an opponent flee. Disengage when the threat goes away, yes, leave the area without increasing the threat to me if possible, yes. Render an attacker incapable of continuing to attack because the technique I used in self defense injured him? Mine is a defensive art, we normally only defend when attacked. But when attacked we defend and what happens to the attacker is on him.
