> Before jumping to conclusions, are we sure these Waymos hit from behind didn't awkwardly and randomly stop in the middle of a busy intersection (where no sane human driver would)?

I'm nearly certain that I'm alive today because I drove as defensively as something like a Waymo. One day as I was approaching an intersection where I had a green light, I saw a car approaching the same intersection from the cross street at a speed that they couldn't have possibly stopped for their red light.

I instinctively slowed down suddenly and that car, as I predicted , ran the red light at high speed and turned just a few yards in front of me.

If I had been more tired, hasty, or it had been darker out, I might not have seen it or reacted in time. A fully autonomous and defensive driving system wouldn't get tired or hasty, and lidar can see fine at night.

And yes, I might have gotten rear ended, but that's a far better outcome than getting t-boned by a car going 65mph.