"If he didn't think he could've thrown, he would've told someone."
Don't agree. Most kids would say they are fine even if their arm is hurting.
"I think most coaches would do what was done. I think it is wrong."
Agree on both counts. To me, it's the coach's job to make the call the kid won't make. Teens think they are bullet proof...coach's know better and should decide accordingly. It will vary by kid, and the coach needs to know his kids. But sending a player to the mound in that situation is a lot like sending the running back with the concussion back in the game. Parents need to evaluate the coach and decide if he's one they can trust in such a situation. If not, they need to step in and make the decisions to protect the arm the coach won't.