Don't you hate it when you get the kids ready to go and put their shoes and socks but then you forget something small so you run upstairs to get it, you pack the kids into the car, drive 15 minutes to the more affordable grocery store to find out that both of your kids took off their shoes when they were still at home and you didn't even realise that they took them off because you just put them on their little feet. You don't have the time to drive back home for just the shoes so you go as is. Then you get some weird looks from people because both of your kids are not wearing shoes and both of the kids are crammed into the shopping cart.
I think if we lived in the country, children not wearing shoes would be ok to do. But we live in the city where there is more old gum and cigarette butts on the parking lot asphalt than asphalt itself.