No doubt, but it's still inconsiderate of you to hold people up. It's not about being impatient either. So everytime you some up behind a vehicle on a two lane road, you expect them to pull over, out of your way, or they are being 'inconsiderate'?
I'd say 98% of the time vehicles are traveling at or above the posted speed limit. For the occasional Raison driving 20 under, I say run the fucker off the road.