wrestlingmom,
While I would have no problem reporting abuse when I witness it I'm not sure I would want that responsibility "mandated" upon me. The definition of abuse is kind of like porn in that there is no good definition, but I know it when I see it. Some would consider it abuse if they see a parent spanking a child in public, I don't. As a parent I would prefer for any diserved discipline be done in private but sometimes that isn't possible. I would agree that many of the cases we see at youth sports events probably have nothing to do with discipline but rather poor sportmanship on the part of the coach/parent. But, if I'm coaching a child and that child displays poor sportsmanship then you can bet I'm going to get in that child's face about it. The age of that child would determine the intensity of the lecture. I personally would not curse or use degrading language but you can bet they will know I'm upset. I would never consider it necessary to discipline a child over a perceived lack of perfomance in an athletic event.
Another concern I would have about mandating abuse reports is the lack of tort protection.