I cannot condone what the two Brighton Grammar schoolboys did. It was unconscionable and vile. But I do believe that expelling them from school is too harsh a punishment. They may have difficulty getting into another school and this may have an effect on their further education opportunities. Their life opportunities depend on their school results.
I would have liked to see them named in front of the school and made to apologise to the school community. As well as that, I would suggest community work of some sort every Saturday for several months would be appropriate. The two boys would have to give up going to the footy and other pleasures that they partake in of a Saturday.