I used to fly those things as well. Yup, red and white plastic. It never even occured to me that a kid could truly hurt themselves with one of those. Mine usually landed out in the asphalt street and cracked. So much for disposable income. Where it concerns larger, more powerful solid fuel rockets, the National Association Of Rocketry has guidlines, launches run by qualified members and safety above all else in mind. FAA clearance when neccessary, certification flights for the more powerful engines and open to the public displays and launches.
For this rocket, I need to be a certification level 2 to buy the reload for my casing. Once certified and given a certification number, I can purchase my reloads from any manufacturer with proof of my cert. by giving them my cert. number. This system keeps the undesirable elements from obtaining these motors and using them in a wreckless manner.