My kids went to public schools and I had my share of problems...and they eventually learned that I was right, but they made the whole situation an adversarial one. The school administration are not the parent.
They attempted to commit a five year old. There are alternate schools for children with behavioral problems with a better adult child ratio. With my history, I can easily believe the school administration lost it in a power struggle with the mom. The mom may well be resisting the idea that her son was having problems.........but to be unable to deal with a five year old having a temper tantrum is outrageous. I cannot fathom a kindergartner being handcuffed and taken away by the men in little white coats to the funny farm. It is unreal.
As to calling this violent....this is not a 200lb middleschooler.....this is a kindergartener.
The above definition of violence plainly says that the child's actions of breaking a door glass and knocking stuff off of the principal's desk were violence because those actions resulted in damage. Obviously, one doesn't need to be a 200 pounder to be violent.
The kid is supposedly 5 years old, even though he is as tall and heavy as a ten year old.