I was also disgusted by the number of curves being thrown in the LLWS - way more than in a high school game! Blame the coaches and the Dads. Wait, that's us! It must be the "other" Dads and coaches, right?
My son learned the hard way about the slider and the curve. Fortunately, no surgery and very strong now. I tell others to back off all the time - sometimes they listen. If major leaguers told their own stories and people saw they got there without curves and sliders, then maybe things would change. This is a more serious problem than steroids, greenies or HGH, as it affects kids. Why can't Little League require education of coaches on this subject and sanctions?
Tired arms result not only from high pitch counts but from then putting those players out in the field at SS, catcher, or other high intensity positions. Again, it is common sense, but coaches just have to win no matter what the cost.