Rubbish. A six-year old child with a psychiatric disorder—not a psychosis—that makes him socially awkard and given to frustration when dealing with other people throws a tantrum and grabs an adult’s shirt. Treating it the same as if a 15-year old threw a punch is absurd.
It’s a matter for the school and the parents to deal with, not the courts. (Are you sure you aren’t hanging on to some ideas from your former affiliation? The courts are not omnicompetent.)
Rubbish? The kid screams all day and pulled the teacher down from the rear, then pummelled her. I don't think "socially awkward" is an adequate description of little Nathan's problems.