I always imagine that people talking about being a sheep dog carry one of these as well.
I carry to protect me and mine. If I see you or yours in an altercation; I will stick around to be a good witness as long as it does not put me in any danger.
Once you start looking to inject yourself into a situation that you know will require the use of your weapon, you are no longer carrying for personal defense. Oklahoma is a castle state, I have no duty to retreat; but I also have no legal standing if I take action against someone that was not a threat to me.