When there's no longer a human watching there will be cameras. Instead of the driver telling people to knock it off right away, passengers will do whatever. The

When there's no longer a human watching there will be cameras. Instead of the driver telling people to knock it off right away, passengers will do whatever. Then they'll get a hefty cleaning bill in the mail or kicked off the platform after the next passenger reports issues and a person checks the footage. It won't be perfect, but hopefully it will be good enough