Anyone who deals with kids knows that kids don't always have the awareness to stop for passing cars. A developed adult would, but kids just don't stop.

Even when accompanied with an adult holding their hand, they let go of it and dash to run into passing cars. That's why you are not allowed to pass school buses when they stop.
You have to assume that kids brains are wired to attempt everything that would kill them. Tragedies happen all the time because of that and it's sad and serious not funny.