Yep. The key point here isn't whether autonomous cars will be better at solving general AI problems related to accident risk than humans [although the OP's extraordinary claim that this will be 'easy to get in a short period of time' requires extraordinary evidence], but who the liability falls upon when they don't, and what happens when this is tested in court.

When a human is accused of an egregious driving error with serious consequences, it's a discrete problem. When software makes an egregious error, it probably isn't, and simply removing that particular instance of software from the road and paying off directly affected parties isn't likely to be a satisfactory resolution.

To take another example from aviation, two 737 MAX accidents attributed to its software see the entire fleet grounded and very serious questions being asked about its future, and by extension the company's. That entails much more expensive consequences and complex legal cases than car accidents for which humans are held responsible, even though car accidents are much more frequent.