If they're innocent, they should be allowed to attend class.

If they're guilty, they should be expelled.

What is suspension? Guilty until proven innocent, or a ridiculous slap on the wrist?

aren't allowed access to more victims.

This is just the latest manifestation of a disturbing trend. Maybe it's the use of cell phones as an intermediary between the person recording and the events being recorded. It's as if putting your phone in front of your face turns everything to entertainment, to fiction. Then there is the bystander effect when everyone waits to see how the rest of the crowd reacts. Really, it would have taken just one person to break the spell of inertia.

That one of my kids was there and did nothing, they would be punished. I would expect them to write a letter of apology to the community and to do at least eight hours of volunteer service in lieu of their lack of character and judgement. To be involved even as a bystander/witness and do nothing would be an insult to one's parents and family.