Thanks for the context, I didn't realize the supervisor sits in the passenger seat in Austin. They do have a kill switch / emergency brake, though:
> For months, Tesla’s robotaxis in Austin and San Francisco have included safety monitors with access to a kill switch in case of emergency — a fallback that Waymo currently doesn’t need for its commercial robotaxi service. The safety monitor sits in the passenger seat in Austin and in the driver seat in San Francisco
Waymo absolutely has a remote kill switch and remote human monitors. If anything Tesla is being the responsible party here by having a real human in the car.