When I think back to childhood, I often wonder who was at the control panel in my little brain. Like, really, I'm pretty sure I wandered around on autopilot for a good portion of my young life, not thinking at all about what I was doing or why I was doing it. But that's childhood for you.
And that's why parents need to stay vigilant. Kids aren't always the best at making good choices for themselves. Parents can think ahead to keep them safe from themselves as well as the world at large.