Comment by theamk
Your general luddite argument - preserve way-of-life of the small group at the expense of a larger group.
In this particular case: for many people, Waymo provides a better service (clean, safer driving, etc..) than Uber or Lyft. This threatens livelihood of human Uber/Lyft drivers. If you sympathize with human Uber/Lyft drivers, and don't care about Waymo users, you want to make Waymo worse, hoping that the people will stop riding Waymo and move to Lyft/Uber instead.
One way to do so is to make riding in Waymo unpleasant, and it's certainly unpleasant when people are cutting your car off all the time!
If you are sitting in a waymo vehicle, and somebody cuts you off - do you even notice? They don't have them round here but my idea is that the vehicle itself is doing all the work, you can just continue reading your book, chat or get on something else with little awareness of the actual journey. Does the waymo curse and shake its little fist to alert you it was cut off?