MTGreen, sorry, but no.
Your quoted example supports Laudieri. The armband kids were wearing armbands, but not behaving in deliberately disruptive ways. Laudieri was wearing a shirt, and was not behaving in a disruptive way.
The disruption came when he refused, rightfully, to remove the shirt. Even then, he simply refused. Other kids may have started yelling, but that is not on Laudieri.
The teacher was wrong; the teacher was also very likely to have been politically motivated.