re: PSA - Wipers ON, Lights ON - Hazards OFF

Before auto lights on was a thing a lot of people would only use what is called Parking lights (not direct beams) when it got to be dusk. It used to drive me nuts because why not put the lights all the way on? Are they conserving their actual headlights? I have noticed a sharp decrease in that but a big increase in the hazards thing. Also if it starts to rain people slam on their brakes and go 30 mph less immediately. To me that is more dangerous than maintaining your speed.