"According to a link above they cannot distinguish a bus from fresh air! "
Actually no, it recognised the bus for what it was but pulled out in front anyway, "assuming" that the bus would slow down to let the car merge into the traffic. Instead, the bus didn't slow down, for some unknown reason. That's rather different from not realising there was a bus at all. In fact it's arguably a rather... human... mistake.
Lawyers and insurance people would, I suspect, rather enjoy trying to overcome those obstacles, rather than regarding them as something not even worth trying to surmount.
In the end, no matter how you try and sell it, the idea of banning self-driving cars because of some weird hypothetical conditions in which they fail is akin to saying that the current human cost now doesn't matter because self-driving cars won't be perfect. No doubt. But they're probably rather better at driving than we are.