Human drivers that are at fault face repercussions that affect the rest of their lives. Robot drivers that are at fault face repercussions of a minuscule fine and a "sorry... again" press release.
If you do something dumb and it kills another person, there's an excellent chance you get tried for manslaughter and a decent chance you go to jail. Unless it was in a car, then it's just a "car accident" and most likely you won't even be arrested because well, you were driving a car, sometimes killing people just happens right?