Note: Personal opinion and observation, not citing anyone in particular on this thread, just an amalgam of experiences:
I find this thread very interesting, because it seems that the majority of posters and folks that I talk to on a day to day feel that they have the right/privilege to go at a certain level above the posted speed limit without (very much) fear of consequence, and if someone else is exceeding the speed limit, even in an act of passing, yet still not going "fast enough", they are subject to the very same ridicule as a person going less than the speed limit in the passing lane.
I concur 100% that slow driving in a passing lane is every bit the hazard that greatly exceeding the speed limit is, and it can be compounded when some is going 10 mph under the limit and someone going 10 mph over the limit approaches from behind.
I often encounter a scenario as follows: Traffic in the right lane moving at 70 mph (speed limit on local interstate). I typically drive about 73 or 74, not quite 75, because that is the speed to which I feel "entitled" to drive without much fear of being cited. So I routinely pass slower moving traffic, which is usually on the right. However, if it is a long string of traffic, it may take a couple of miles to get around it. In the meantime, I'm approached from the rear by a vehicle who is going much faster (let's just say 80 to 85 mph). Of course, they snuggle right up against my rear bumper in an effort to get me to move faster.
Why should I be obliged to further exceed the speed limit, beyond my comfort zone, because someone else wants to exceed that limit by an even greater margin? If I speed up, I feel as though I could be exposing myself to a citation, and I have personally witnessed multiple cars being pulled over at the same time in our area (the old speed gun on the overpass/deputies on the on ramp scenario). I tend to just motor along at my cruise control speed (which is above the posted speed limit), until I can return to the right hand lane.
I was also taught that before moving to the right hand lane, make sure that both of the headlights of the car behind you in the right lane are visible in your rear view mirror (as a rule of thumb). Very often, in the scenario listed above, before that happens, the rather impatient driver behind me will quickly change to the right lane and pass me on the right (I don't usually look to the right because I assume I might be getting a rude gesture), but I feel this is a hazard.
Am I at fault because I am unwilling to exceed the speed limit by a greater amount just for the convenience of someone else who (most likely) simply wants to go faster? Should all on the road yield to the fastest driver? I'm curious of the opinions, but will also say with a large degree of confidence that I will not change my driving habits, as I have never, ever, ever gotten a speeding ticket (got a written warning once for 68 in a 55 while I was passing someone on a 2-lane road - in my Samurai, no less!) , nor have I gotten one for impeding traffic, nor any other kind of citation.
And for what it's worth, when there are more than two lanes on the interstate, I very seldom drive in the furthest left and leave that for the speedy.
Good luck and take care.