I'm kind of thinking in a lawless yet relative calm situation, the pistol is there concealed to fight my way to my rifle if not on me. Of course its always going to vary in real life, along with what you are trying to do at the time.
Say something like a natural disaster of some sort of situation of disruption of order, and you are trying to go buy gas or whatever and don't want to get car jacked, we would like to think a slung rifle is a message to stay back. But that doesn't always work that way in real life in chaotic situations, look at the cases where they just attack you anyway, like Rittenhouse, or ICE agents now. There is a cognitive disconnect with people who are unstable enough to want to use violence that there is no thought of consequence, even immediate, so a rifle pointed at them is no concern for some, maybe too many cases now. A concealed pistol may or may not be a viable alternative. I mean if they are going to walk into a rifle, what's going to change if they don't even think you are armed? It may give an edge of surprise, though they likely already have the initiative, and you are reactionary anyway. So I guess know your situation and act accordingly.
Having said that, absence of authority is generally temporary so maybe going full warlord is not the best strategy long term, even though I lean to the 'kill them all, let god sort them out' strategy in a high threat scenario. Even in the old west they hung thieves and murderers when there was no law enforcement around, so you have to take into account your own consequences, as we do now with a highly controlled system.
I'll be hunkering down as well, unless some sort of calamity forces us out, it's probably most likely any real threat of unknown origin that are successfully dealt with, without any authority around to come clean it up, will be resolved as some lonely patch of disturbed earth somewhere on the Wyo-braska plains.