> Robotic car manufacturing hurt some auto workers, but all of society gets cheaper cars

This is false. Over the past forty years, the rise in price for the median car sold in the US has far exceeded inflation. The idea that "society gets cheaper cars" is false, cars have gotten more expensive, even taking inflation into account. The US Bureau of Labor Statistics keeps careful track of such things.

Obviously automating something will benefit someone. You have your facts mixed up however, thus your conclusion that it benefits "society as a whole" can be disregarded.