If this happened in a classroom or a cafeteria or anywhere on schools grounds to a coach, administrator, janitor or anyone associated and working for the school, those kids would have been arrested that day! They would have been expelled from school and would never be allowed back.
WHY would this be any different?
Coaches MUST stop being the kid's friends and trying to defend them! The kids are learning nothing from this. This is the same attitude parents take when their kids get in trouble in school now. The parents defend their kids regards of how bad they have acted. I'm my day, your parents came and picked you up, took you home, and beat your rear!