Meh, keep the little nippers leashed!
Seriously, the 'kid leash' was all the rage for awhile. Parents could keep track of multiple little ones, and it was harder for a predator to snatch one when they were attached to a parent.
It also makes it easier for the parents because children are small, agile and FAST, and can get away from parental clutches easily. I'm sure more than one parent has had a heart-stopping moment when their offspring disappears into a crowd of people.
I like 'em. I liked 'em when they were in fashion, and I'd like to see them come back into fashion.
Kids have minds of their own, and don't always obey their parents. That's nothing new, and has been going on since the dawn of time. Especially the smaller ones, because their cognitive functions are pretty low, and their whole world pretty much revolves around themselves.
It has little to nothing to do with 'control' if a child darts away from a parent. Kids don't think that someone might snatch them; all they're thinking about is what FUN it is to run away from Mommy!