You're kidding right?
Stroller= baby
Leash= animal
Stroller = baby that can't walk, and so must be conveyed. Leash = animal that will run off if not contained.
Translation: Strollers are for transport, not for containment. Using a stroller to restrain a child is the same as using a tether, except worse for the kid, because he/she can't move at all. So using a stroller for containment is actually treating the kid worse than we typically treat a pet -- at least the pet gets to move a little.
Now, if what you're saying that you can constrain a kid in a stroller without people realizing that's what you're doing, because most people will just assume the stroller is being used for its intended purpose, then I understand.