I.e. did the uber car kill this 1 pedestrian, because it avoided killing 2 other people? Did the uber car opt for the "least killing" in this siutation?
I think this whole trolley car question - while a nice philosophical question - is silly though. I dont think humans would do any better in an emergency situation. In that split second when you suddenly find yourself in the "oh sh-<IMPACT>" situation, do you have time to a) make a deliberate, reasoned & fully-informed decision, and then b) control the vehicle effectively to follow through on that decision? I doubt it. If you had a second or two to think it through and then deliberately make a choice and steer towards that crowd of nuns, you'd probably be able to entirely avoid the accident anyway.
More likely is you'd probably do what I am sure most people do which is gasp, stamp on the brakes, shut their eyes and hope for the best ... assuming you even had time to realise there was about to be a crash before it happened. Some people might swerve, but I suspect they do that instinctively to avoid something in their way, not as a decision to hit something else.
I just dont think self-driving cars will get themselves into situations where they have to chose who to kill in the first place. And even if they did get into those situations, I really, really doubt it would be due their actions, and I'd certainly trust it to avoid the crash in the first place a whole lot more than the average human driver in the same scenario.
Some could argue "Ah but yes computers are so fast that they CAN make that informed decision about who to kill in milliseconds! So they have to make a choice! The question stands!". I'd argue back that in those milliseconds before the crash was inevitable, they'd act to prevent the accident before a human would even know what the hell was going on anyway. After that it just starts getting into a game of who can conjure up the most ludicrous hypothetical situation that rarely - if ever - happens in real life.