"Also, at least when Google was testing cars around Mountain View, the driving behavior was extremely conservative."
That makes perfect sense. In Google's case, Google was 100% liable for anything at all going wrong. In Tesla's case, they passed the buck on to the drivers by saying "While using Autopilot, it is your responsibility to stay alert, keep your hands on the steering wheel at all times and maintain control of your car". They basically made their customers beta testers for them. With that in mind, which company do you think is going to move more slowly/carefully than the other? Which one is going to rack up miles more quickly?
Forbes claims that Tesla's autopilot is "almost" as safe as driving without:
https://www.forbes.com/sites/b...
Forbes also points out that Tesla's auto-pilot is limited to highway driving because city driving is much more difficult, and has an accident rate 3 times higher. OTOH, Google seems to excel at fully autonomous city driving while still having impressive safety stats. In this case, I would rather bet on a company that safely gets close to solving the city driving problem with 0 fatalities and almost no accidents where its cars were at fault over a company that recklessly rushes out a half-assed solution for the much simpler highway driving and with multiple fatalities caused by its autopilot.
Having said that, neither company has solved all of the problems. Tesla is being more reckless, but they may reach the finish line first for that very reason. They don't mind breaking a few eggs to make this omelet, and while it's kind of sleazy because those eggs are people's lives, that doesn't mean they won't get there first.