Yes he did wrong and should have at least phoned the police however the media have been wrongly focusing on him.The taxi driver who fled the scene after dropping off AR and hearing the screams when he attacked has been stripped of his licence.
I think that's fair, because no matter how shocked I can't picture any situation with people being hurt where most would not try to help even if just ringing emergency services and waiting for them to arrive or something.
It's the various services involved and Axels parents who are to blame not a taxi driver and not the teacher. Everyone makes out they would be a hero but in a situation no one knows what they would do fight , flight or freeze. It was wrong he didn't call the police but it's not his fault Axel massacred a dance class. He definitely deserves to lose his licence but Axels parents knew how dangerous he was and did sweet duck all.