As a former athlete and a current coach this type of behavior is not tolerated. These seniors should be punished to the full extent of the law and possibly be expelled from school. Bullying is a serious problem, We just had a student kill himself in 8th grade due to being bullied.
I remember being put through a little hazing growing up, but nothing like this. I also do remember our coaches watching the locker-room to make sure we were not getting out of control and there were no issues. Now a days coaches are never in the locker rooms. Prime example (coaching a basketball game, we are at halftime in our basketball lockeroom and next door all we hear his screaming and yelling in the wrestling locker room. My assistant went over there and found two wrestlers in a full on brawl in the locker room. No coach present, one could of beaten the other kid to death for all we know but there was no coach.) We reported it our AD & Principal and both wrestlers got expelled and are out of wrestling for 4 weeks after christmas break. But it just goes to show, coaches do not supervise their athletes before and after practice.
Bullying is a very serious issue in schools and sadly educators can't catch it. A lot of it is cyber-bullying and happening outside of schools. Its a scary world out there for some kids, I know schools are looking into severe punishments for kids who are guilty of bullying (i.e no extra curricular activities at all.)