I said, “it might be a good personal policy”. Responsible armed citizens should retreat if possible, if for no other reason than avoiding the mess you will get into if you shoot someone. But I was specifically addressing a claim that it was required.
I'll continue to maintain that it's required, because I wouldn't want to give some poor starry-eyed sucker the idea that in his particular case, this one time, that things will go swimmingly for him.
Remember, you're dealing with the Jesters System, and most of them don't like peasants exercising their Natural Rights. Ask young George Zimmerman.