people walked in public places was to go to a place where carry was permitted in some form or fashion and that therefore a ban on public carry didn't significantly burden the right.
Not that practicality seems a strong point in this case, but suppose that every place I want to visit in town would allow me to carry, but it would be illegal to carry on the street, as open carry is banned in cities and concealed carry is banned in cities without CCW.
So,
(1) I unload and lock my gun in its case, take it to the car, and drive to my doctor's office. (Disarm)
(2) I bring in that locked case, open it, reload the gun, place the easily handled paddle holster on my hip and holster the gun. (Arm)
Having completed my appointment, I want to shop for groceries. Leaving the doctor, (1). Arriving at the grocery store, (2).
Time for lunch - leave the grocery store, (1) and drive to the coffee shop, then (2).
I need a haircut, so (1) to walk 1 building over in the little strip mall and (2) at the barbershop.
After the haircut, (1), back to the car and a quick trip to the hardware store, (2) and then home again, (1) for the trip and (2) when I get home.
Carrying an unloaded gun in a locked case is hardly 'having a firearm ready for use in self defense'.