Bobbleheaddoll,
I respectfully disagree with your statement. Most pitchers will tell you why they injured their arms, whether it be from throwing too many CBs and sliders at an early age or overuse.
We know for a fact that smoking is bad for our health, though some people who smoke never get sick and some who nver smoked in their lives do. The odds are not in favor for the one who smokes. The same goes for the very young pitcher who throws CBs early, it is a a known fact that it puts undo stress on the arm, little league, big league, whatever.
Most young pitchers who develop the CB early WILL not rely on the change or FB later on because the results are not as successful, nor is the velocity.
What has worked for your son and working now may not work for another.
While I agree with troy that the subject pushes our buttons, the decision is left to the player and parent. As parents we thought that it was unnecessary and still feel uncomfortable with the fact that he did throw them even at 15,16.