At the moment, no outlets seem to have reported a motive for the attack.
Okay…
The California DMV suspended Waymo rival Cruise’s robotaxi operations after one of its cars struck and dragged a pedestrian last year, and prior to that, automated taxis had caused chaos in the city, blocking traffic or crashing into a fire truck. Just last week, a Waymo car struck a cyclist who had reportedly been following behind a truck turning across its path.