Trolley problems..... I keep getting an impression that the point is that people don't have enough inhibitions against killing for the greater good.

I don't really like trolley problems either, but I don't think they can be waved away. When programming a self-driving car's decision algorithm for reacting when a car full of people skids in front of it while there is a single pedestrian on the sidewalk where it would have to swerve, you are essentially dealing with a real -world trolley problem.