Agreed, in a true SHTF scenario, I'm booby trapping my property, woods, and certain areas of my home. Punji pits and all. Especially if it's dark out, I'll just light up the night sky at every noise I hear. I'm not taking any chances.
In the old west and maybe today, before you come up to the campfire you call out. Let people know you are there. Even today in the southern rural areas, when you pull in front of someones house you don't jump out and go right for the door. We wait in the car for a moment and make our way to the door. That way folks can get ready alittle for company. In a shtf, I'm sure even more measures would be worked out.
I beep the horn a couple of times. Holler out and let them know you are there, making yourself a clear target with your hands empty and in sight. it's just polite.