Society's definition of abuse is mainly physical. If we can see a slap or a punch, we can replay it over and over, analyzing every move. We have concrete evidence of who's at fault and who's the victim. When it comes to mental abuse though, there is rarely evidence.
From my perspective, young athletes are some of the most vulnerable people to work with. They have dreams of college and the future, and they will do anything to get there. They haven't seen life for what it really is and will trust most people.