Probability of apprehension is the deterrent to crime, a visible firearm may deter a miscreant, reminding him there is a big price to be paid. Concealed can give a needed edge to end a problem if needed and also give pause as one cannot be sure who is and who isn't equipped.I've never even fired a pistol, but even I know that.
Of course I do have a lot of friends who never leave the house without a firearm somewhere on their persons...
But yeah, if I had a gun I'd definitely not be putting it out on my hip for everyone to see. Keep a little mystery in the game. Make the psycho work for it. Keep him guessing.
Whatever He guides you to do. We know the Lord can protect us far better if we dwell in the secret place of the Almighty.