Your question poses a serious anwser and a more logical one. Here's the serious one: Suppose they feel that the ground asborbs more water faster, that is techinally ture as the porostiy and cappilarity is much greater, and therefore the runoff is much less. Though...since the driveway is angled and has very little porosity it has greater runoff and therefore during times of high rain the ground reaches it's say carrying capicity while since the driveway doesn't have any carrying capicity it doesn't develop ponding. That's my take on it, gets very complicated and that's what some people do for a living.
Here's the other anwser: They just want to piss you off and throw the paper on the grass, as a result of them staying in their car and throwing the newspaper. I don't know

Hope that helps if that was a real question or just sarcasm accidently moved here by ED.