Workplace bullying is fairly common too, it just follows the corporate hierarchy.
> Why should it be tolerated when it happens in school, where the victims have no choice but to attend every day?
Since it's where they go to learn that this behaviour exists but is bad. You need to have lighter sanctions in order to teach people about behaviour without ruining their lives in the process.
In public school, you can either report the abuse to an authority figure who has little or no ability to actually remedy the situation, or you can... sit there and suffer? Fight back? While outside of it, you have more ways to remedy a bad situation than "just make your abuser respect you."
Should we get our children bullied deliberately then? It is not necessary to be bullied to learn that humans can act like that. I've never been assaulted, for instance, but I know that it's possible and act accordingly.
I hope your children don't get "exposed to this reality" in school, as you put it.
The sorts of harrassment that school bullies inflict on their victims is, to put it simply, not tolerated anywhere else. Why should it be tolerated when it happens in school, where the victims have no choice but to attend every day?