They will try to brake, and if that's not enough then that's not enough. As interesting as such philosophical discussions are, cars won't be making "decisions on who to kill", that's ridiculous. They will just brake. Same as any other automated machinery, it just stops in case of an emergency.
The car horn makes a fart noise as it bounces over the body without slowing. Other pedestrians dash over in horror. The car's rear printer has littered the street with fliers reading, "a cabal of Jews controls the planet," and, "I cannot believe Grimes left such a smart and handsome guy."