I don't know about autistic children, but having raised two boys I know that it can sometimes be like training mules. Sometimes you can entice them with a carrot, but sometimes you have to (metaphorically) whack them between the eyes with a 2x4 to get their attention. A tantrum is just that, after all; a bid for attention. Teach them that they're more likely to get negative attention from that behavior, and provide positive attention for good behavior, and you've won the battle.
Until the audience returns. You've just shown him that he can get his way by being disruptive.Take away the audience and he will eventually quieten down.
Part of what they have to teach is proper behavior in a social situation. Let him get away with such behavior in a classroom at a young age and you'll have him throwing tantrums as an adult as well. After all, he's learned he can get his way and plenty of attention that way.But he was disrupting the whole class and they would not get their eggs pained. Oh dear I mean to say the life of a seven year old is short and we can never go back. I suppose they can’t paint when they are eight, conclusion....the teachers were on a time schedule and pass the buck we need to get home today.
That being said, it seems rather obvious that calling the police and sending the kid to a hospital was going way overboard. But when teachers are no longer allowed to discipline unruly children, what recourse do they have? Teach him, and the other children, that you will evacuate the class and turn your back on such behavior and you wind up with a class full of potential Saddam Hussein's.