The are a few people who are complaining about a stapler being declared a deadly weapon. Thinking it's funny. Ask the kid who was knocked unconscious if he thinks it's funny...
First - the police will always go for the highest level charge. The charge can always be reduced.
Second - the stapler was used to inflict lacerations.
Third - the stapler knocked another victim unconscious.
No different than using a brick if you think about it.
As for discipline at the school - they have their long-standing rules regarding this type of behavior. It has nothing to do with race. If you attack 2 people, inflict bodily harm, knock another unconscious and then subsequently charged with assault - typically you're not coming back to that school.