Back to my earlier post, what actual risk would you say was present in what the kid was doing? Not some mythological set of what ifs, but an actual probability. Put that another way, when was the last time you saw anyone driving around a retail park that needed to stand hard on their brakes? When was the last time that you saw a car accident? And how many cars do you see every day?I have three young children and would NEVER knowingly put them at risk by my actions or by inaction.
As has been suggested, we used to do lots of stuff without the safety features of today's cars, and we didn't die from it. The risk might be slightly increased (but I'd still like to know your estimate of the actual risk compared to driving whilst wearing a seat belt!) but it is still, in reality, vanishingly small and much smaller than a whole bunch of stuff that I reckon would be faced by most young kids do on a daily basis.