Define winning.
i have yet to hear anyone in the MMA groupthink define "winning" in a way that has the best possible outcome along iterated instances in a real life scenario that is an acceptable choice for a civilian population. by civilian i mean those who are under no obligation to confront or intervene in interpersonal violence.... meaning not police or doormen/ bouncers.
what the MMA Groupthink fails to understand is that the "best possible" outcome does not always equal beating the other guy up. i fully understand the concept of the ability and willingness to engage and dominate. while it is unacceptable to not engage and dominate due to a lack of ability, that doesnt mean that if you have the ability to do so that it is always the "best outcome" of the situation.
if we turn the situation away from bar room fighting and look at confrontation within relationship we can see the issue without the bias.
situation:
your arguing with your wife in a very heated way, is it the best outcome for you to "win" the argument? you may think to yourself ..."
well i really showed her!! i demolished her stupid point" yes you won the argument but you have to go to sleep you know...

do you want to live with her after that..she is going to be bitter about it forever and your not going to have a happy relationship. maybe the "best outcome" is not to win the argument but rather find another resolution that doesnt involve you dominating the conversation and demolishing her opinion.
when you have to pay the consequences for your "WIN" the next day, sometimes it aint a win.
EDIT:
this is the concept of the Nash Equilibrium. what is the best possible outcome for you...but also for you the next day and the next year...that is also the best possible outcome for your family, AND the other parties involved. people have a thing called retribution and restitution that needs to be configured into the outcome.
to only think about winning the fight is very short sighted.