If you yahoo or google search, "child fatalities on snowmobiles", you will find lots of interesting reading on the subject. Especially eye-opening is:
www.adn.com/adn/snowmachines/main416.html, which is a little dated but provides factual, albeit unfortunate, information about what things are like when laws and law enforcement are at a minimum and people are left to be responsible for their own actions.
I personally cringe when I hear people bragging about juggling babies on the back of motor vehicles of any kind or even around large farm animals for that matter. Or whenever I see children riding up and down the streets without a care in the world (a daily occurrence in the Keweenaw) or Dad carefully riding a soft-tired ATV up the pavement on Brockway Mountain Drive with a small child seated in front. All too often tragedies occur, oftentimes in peoples own backyards, involving small children, very slow speeds (at least until the throttle sticks or the truck slips out or gear or off the jack or something else unexpected happens), and parents who are thinking that they are being responsible with these very innocent and totally trusting potential victims. The parents are always shocked and say they were being careful, and things like this aren't supposed to happen. Guess what, they do. I know you can never guarantee safety, but why tempt fate with the lives of others?
Some people can develop the skills, strength, and maturity to operate safely at a relatively early age. Some people never can. In my opinion, you need to develop these prerequisite abilities through non-motorized activities first before jumping on motor vehicles of any kind.
People should do the right thing and use common sense without having a rule or regulation dictating what they think they can safely be doing. Ignoring the hard cold facts and historical information doesn't really help either.
Bring on the heat...