I mean I don't want autonomous cars to follow directions by humans that sound like "plow into this crowd of people". Even things like microwaves don't let you turn it on without the door closed. I don't see how this is any different.
"Plow into this crowd of people" is nominally wrong, but what if its actually "plow into this crowd of people that are hurting and robbing a family with two small children"
Your smart hammer refuses to let you smash into a glass window, but what if you were smashing into the glass window to save a child stuck in a fire?