Blaming the other motorists is kind if disingenuous, and a cop-out. Even with aggressive rollouts, there will be mixed traffic for decades and if AVs can't play nice with humans, it's a problem no matter who's nominally at fault.  

The simple fact is that AVs have been getting rear ended far more often than human drivers do. That suggests it's not entirely the fault of the human drivers, there's something about the AVs that is causing them to get hit, probably because they are overly cautious and don't behave like humans.