That 5 year old had a serious problem. She was being completely disruptive. Assuming the class had 25 students in it -- her temper tantrum seriously negatively impacted at least over 30 people's day. (Her classmates, teacher, asst. principal, 3 police officers, her mother, and all the people who work with her mother). That's crazy.
Police officers are not intended to be substitute baby sitters. If her behavior required that they had to come in to remove her from the premises, why should it be a pleasant experience for her? She had plenty of options to calm down before they came. And she did not do so until they were in the hallway. Did you really watch the video? Also based on my mother's (former kindergarten teacher) stories, the worse kids had the craziest parents. If the little girl had gotten bruised while trying to run away from the officers on the way to the police car, the mother may have sued. The police officers have an obligation not to leave themselves open for lawsuits.
Claus, what would a teacher or asst. principal do in Denmark?
ETA: Perhaps the best solution is to allow corporeal punishment again in the schools. {Shrug}. However, I suspect it was made illegal in the USA because enough teachers were abusing it.
Edited for minor grammar changes.