You might as well blame DNA. If the human arm was meant to throw baseballs at 100 miles an hour eight months of the year, we would have been born with ball bearings in our shoulders and elbows. Makes the feats of guys like Walter Johnson and Nolan Ryan all the more remarkable -- 20 seasons of throwing the ball 95-100 miles an hour 200 to 400 innings a season. Without juice (yes, Roger, I'm looking at you)
The good news. if there is any, is that teams will be even more careful with pitch counts and hard limits on innings for their young aces..