I'd argue that a self-driving car can take actions that a human drivers would not be capable of performing... First of all, it will have much quicker reactions

I'd argue that a self-driving car can take actions that a human drivers would not be capable of performing... First of all, it will have much quicker reactions - and in accidents, those extra milliseconds do save lives. Secondly, it can take calm reactions where a human would panic. For example, if a parson started stumbling around drunkenly on a highway, with human drivers zooming past at 70mph a deadly accident is guaranteed. With self-driven cars, it's not that unreasonable to assume that they will be able to spot the person some distance away and change lane to shift around him or her. It might cause a slow-down in traffic around that area, but there's a good chance the whole incident can happen without accidents.