Maybe that's good. Some of the old unchallengeable authority did some really bad stuff to kids, eg sexually assaulted them.
I am not suggesting young people should not be able to challenge authority - they should have the same right as an adult.
They should certainly not be seen and not heard as the old saying goes as that attitude did result in so many bad things happening.
However, in return for challenging authority they do have a certain responsibility for complying with the rules once they reach 10 years of age.
In this case it appears that this boy did not comply with the requirement to show a valid ticket therefore he is probably in the wrong therefore he is partly responsible for what happened next.
In my early days of teaching if one had a non compliant child - say someone who refused to move or who was being disruptive in class it was fairly common for the child to be removed from the class room using a reasonable amount of force if necessary.
However, later procedure seemed to be take all the other children out of the class room and leave the miscreant behind to be dealt with usually by a member of the senior management team. This could completely disrupt lessons if the problem was prolonged. Removing the miscreant child was a much more effective way of dealing with the issue as it was swift, caused minimum lesson disruption and also other children saw that action would be taken.