Waymos crash less than human drivers

False. Humans are driving in a much wider range range of weather, road conditions, car conditions, passenger conditions, routes, unknown destinations, etc.

Something like a third of traffic fatalities are due to one of the drivers being drunk.

As this explains, these factors were controlled for.

Were these Waymo cars driving in Michigan during the winter or in Boston or New York?

No, but neither were the humans being compared to. It's comparing a Waymo and a human driver, on the same road, in the same conditions, etc.

In my experience there are also many drivers who appear to be deliberately driving in a manner likely to cause an accident. Not sure why. Perhaps either they're very stupid or perhaps they like the idea of hurting others.

Right. So the point is that it's not a useful and practical result, and the title is indeed false and misleading.