Litter Louts

I don't understand why anyone feels the need to throw their rubbish out of the car window as they're travelling along. Who do they think's gonna pick it up? I watched someone do it this morning, and as I was driving myself I couldn't stop to pick it up but it made me really angry. I was taught not to litter, and there are so many ignorant people that continue to do it. They're probably the same people who park across pedestrian crossings when waiting in traffic, or who sit in the yellow box that says "KEEP CLEAR" at traffic lights. I recently had a young couple beep their horn at me (they were in the car behind) for not going into the yellow box at a junction when the traffic was not clear enough ahead for me to do so. Doesn't anybody pay attention to the general laws of the road or society anymore? What's wrong with people?