I don't understand how the police are called for a playground fight? (not even serious!) And then they are allowed to arrest children? Isn't there a law against that?
The children were charged under “criminal responsibility”, which is not a crime, and they did not violate the law. The police did violate the law by locking the children in detention, which can only be done in very narrow circumstances, but there are loopholes, such as using the term TRUE THREAT.