If I'm driving faster than those in the right lane (and therefore passing them) but slower than you, am I obligated to slow down and get out of your way? No, but you're still going to be ****ed because I'm in the left driving slower than you are.
If you're passing (and assuming you aren't just poking along mindlessly, which is another thing entirely), then I have no real cause for complaint, here; this, assuming that when you've completed your pass and can
safely return to the right lane, you do so.
If not you, then others. I've seen them, right on my bumper so tight that if I let my foot off the accelerator, there would be contact.
Yep. Seen it and (to be honest about it), used to be the guy who did that. Not so much any more, because life's too short (although one problem that crops up from time to time is that, when the left lane hog takes a very long time to pass, the guy behind him has to stay closer than perhaps he'd wish, or some other guy will charge up in the right lane and try to wedge in there at the front).
I-95 coming south out of DC is especially bad about this. In most parts there are only 3 lanes and the speed limit is 65. The right line goes about 65, the middle lane around 70 and the left lane fluctuates between 75 and 90+, depending on who is trying to bully their way through.
The fewer barriers to traffic, the better it works, and leave speed limit enforcement to the peace officers. Fact is, speed doesn't kill - it's the sudden stops that'll do that, and blocking passing traffic increases the chance of a "sudden stop" dramatically.
Should the driver going 75 slow down and get out of the way of the driver who wants to go 100?
If he or she wants to promote safer roadways and avoid vehicular congestion and conflict, yes, or, if at 75 MPH, the driver is already passing the vehicles to his or her right, just keep on keepin' on until the pass is done, then move on over safely. Whichever works better for the situation.
###
These days, there is such a large proportion of people on the highways who are pacing traffic next to them, because they are paying mare attention to their cellphone than the road, and drivers with diminished attention tend to "cling" to adjacent cars, speeding up and slowing down with them, mindless of the crwod gathering behind them (or of much of anything else).