If the school sent the parents a discipline guide and let the parents decide what the correct discipline is for each situation, in advance. ie ...
Verbal abuse of teacher : Apology and wash mouth with soap.
Verbal abuse/insult/etc of student : Apology and wash mouth with soap and 10 minutes in corner.
Threaten student/teacher : Apology, 10 minutes in corner and 2 spankings.
Fighting : 3 Spankings.
Being disruptive in class : Wash mouth with soap and 10 minutes in corner
etc. This way each parent can discipline their child in their own way and the school need not worry about lawsuits, suspending teachers, etc.