That's an argument for possibility. If you take that view, you should kill or at least disable (permanently) everyone who attacks you, because there's always a chance they'll come after you later.So let's say I use wrestling moves to pin an attacker down. What then? As soon as I let go, he's free to try and punch or stab me again.
The reality is that it's situational. Sometimes you have enough control to let them up, or you just make the choice that it's probably safe to do so. Sometimes you don't think that's safe, and can hold them until someone helps you (cops, bouncer, etc.). Sometimes you might need to choke them out or break something to make it safe to disengage. Sometimes you don't get the opportunity to make a choice, and you just do the best you can to get out of the situation.