I’ve personally only seen kids on leashes in the context I mentioned above, of a large, crowded event where a few bodies moving in the way of your kid will break line of sight entirely. Outdoor festivals, concerts, fairs, amusement parks etc. I have never seen a kid on a leash at a playground or park or bank or grocery store etc. Toddlers are small and if there’s a lot of bodies around it would be VERY easy to lose sight of them. If my kid ran off and broke my line of sight of him in a crowd I absolutely would have a moment of panic. Again, I’m not going to judge other parents for finding solutions to problems that don’t harm the child.

I got away from my mother at a large event, and left her panicking and organizing other parents to search for me. When they found me she spanked me and yelled at me for running off. It wasn’t the first time and wouldn’t be the last. Obviously hitting me was wrong, but if she had just used a tether it would never have happened.

Something’s lack of representation in media is not exactly a reliable metric of commonality, if it was, gay people sprang into being in the late 90s.