Maybe this is a new thing, I have no idea, but when I was at the supermarket yesterday I walked around the corner and came face to face with a little girl on a razor scooter... closely followed by a little boy on a bike with training wheels. Fortunately for me I am young and fit and I can dodge, although I wasn't exactly expecting to have to take evasive action in the freezer section. However the next person to come around that corner might not be so lucky.
I know that little Billy and Suzie are very excited by the new toys that Santa gave them, but bikes, scooters and all other wheeled contraptions are outside toys for a reason, particularly when they are in the hands of small children who don't have terrific motor skills yet. You wouldn't let them ride their bikes in your loungeroom, so why for pity's sake would you think it was a good idea to bring them to a place like the supermarket where not only are there other shoppers, but also shopping carts, prams and aisle displays to be navigated?