"People shouldn’t smoke in highly populated areas where other people have to breathe in the cigarette fumes.” Then they were asked to respond to a parallel statement about driving: “People shouldn’t drive in highly populated areas where other people have to breathe in the car fumes.”
All it asks is whether people "shouldn't" do x. If I understand people must do x, I'm not gonna say they "shouldn't" just because I'm aware it has side-effects.
Furthermore, I went through the actual study and honestly the other questions are not any better. I'd say this study proves precisely nothing about car brain.