Too much to ask for people to, at least, drive the speed limit?

Ok. I understand if you only want to go 65 (speed limit in L.A.) on the freeway; maybe you are paranoid about cops, or really want to save gas. But, is it really necessary to drive 55, or 50, or less, on the freeway. And why in the left lanes? In my opinion this jeopardizes the safety of all drivers, even the slow pokes. Is there any good reason to drive less than the speed limit? And if there is, or you think there is, I think we must consider whether or not this person should be driving.