I totally agree with you. He's old enough to know what ought not to do. He said he was doing that to show his "power" to his "club" members. His classmates were stunned and got impressed. He called himself "the Little Prince" at school, but he denied it when we asked him. Our younger son told us all about it.
His class teacher knew about it too. She told him that this behaviour must stop or he would be suspended. Well, at least the school has abandoned the previous view that he couldn't be wrong because he was a "star" among the kids.
He has a high IQ according to his teachers and pediatrician. He seems to be using his intelligence in all sorts of wrong ways. Big headache to us!