Ah, gotta love the name-calling. Shows your true nature, pal.
And the expulsion was absolutely appropriate. In fact, it was probably by the book. You break the rules, you pay the consequences. The administrators of the school doing anything less serves only to prime and encourage more inappropriate bad behavior. It also sets a precedent for restraint, which, if not adhered to, can then be used in a legal environment to challenge the punishment.
But hey, let them get away with it, right? They have more of a right than the school system and/or parents of the other students to determine what's appropriate for those other students to see and not see, right?