When your children were in a cart, did you ever take your eyes off of them to look at the products you were shopping for? That can be very dangerous...little fingers could put something small in their mouths, pull a heavy can onto their heads or worse get tangled up with a strap that could choke them. If you claim that you never took your eyes off of them, you weren't shopping or you are lying. And you have a fantastic imagination. If the kid's in a cart in front of you, it's kinda hard to get away with much.
Odd that you try so hard to be insulting in your first post. Debate would have been a better choice.