Since the charges were dropped, It is reasonable to only to know that the superintendent took it up in his actions to be able to get into the bigger picture to understand both sides and to find a way to resolve these situation.
If it was intentional, I still think the police should have not been brought into this but like you said, they (the school) wouldn't do that unless it was a last resort after repetitively encountering that same issue from time to time. Don't they have guidance counselor or some kind of counseling that is offered at the school for that? With that, when it is intentional, you know that there is something wrong and it might be something that happened at home or anywhere else. We don't know what happens behind the closed doors.
I do realize that it is very challenging teaching a child with special needs whether it's about a simple task or a challenging task. Some task might get the children to be overwhelmingly frustrated. Sometime they have a hard time controlling their emotions, which leads to some actions or behavior that they can't have any control over. Like us, we might be able to control our anger or our tantrum but for them, they might know how to express it or don't express it but there's one thing I do know, they sometime act without being able to *think* ahead a step or two.
To answer your question about the math part - If my child was refusing to do math, I would be disappointed, yes but at the same time I would want to know why my child is refusing to do math. Is it because math is too hard on him or he easily gets overwhelmed by that and frustrations sets in? The point is, sometime frustrations gets the best of them and you can say they act out when they think it is OK to do so. Sometime we have to teach them what's right and what's wrong.
!! I agree with everything Jolie_77 stated in this entire thread. Well said there Jolie! I couldn't agree with you more.