Why do people seem to forget their brains when they get in their car/truck?

Oh my gosh I feel your pain. These same idiots reply when I told them to their face: "Don't be in such a hurry. Enjoy the view." I was like....really? Enjoy the stop light when I could turn right on red? No thanks. I would rather get to where I am going so I can contribute to society rather than piss people off.