How do you know what did or didn’t happen to the bully? How do you know the kid with the phone didnt have extenuating circumstances that had been worked our beforehand? You want, when its a rich kid, that the punishment is broadcasted so everyone knows that the rich kid got proper treatment. So you want him to get worse treatment than everyone else.
Anyway those kids are the reason that your kids can go to that school. Jewish schools function, not through tuition but through fundraising. If the rich parents wouldn’t fill in the gaps (and then some) the not rich parents would be forced to pay full tuition. It doesn’t excuse raising kids to feel privileged for nothing they did but it does make you understand why a school would want to keep those parents happy.