I'm confident that self-driving cars will eventually be safer than human driven ones. I'm not confident that this can be realistically achieved without killing some unfortunate bystanders in the process of getting to that point. That doesn't mean we should accept these cars running amok killing people all over the place. It doesn't mean I think this specific case involving Uber is "reasonable" either. I just think, in a general sense, a realist has to be able to try to find some balance between short term lives lost and long term lives saved.