Just a bit of perspective for you...
Also there's no way in fuck you'd have time to react/swerve to a hazard in the road doing near as makes no difference 100 MPH on a road with a speed limit of 55. You're nearly double the speed limit, and at that speed it takes well over 300 feet to stop.
(on perspective)
Actually if that pass did motorcycle, I would be fine, because
a) normal people feel more vulnerable on motorcycle than in car, and would try to weight in options before doing anything, which might disrupt "line" of other person (person can be in car, on motorcycle, on freaking horse) (it's just common sense, no?)
b) since moto is smaller - pass takes less time, and going back to "a", person who is doing a pass probably would expect that I might have to do some maneuver, so they want to make pass as fast as possible.
c) as I mentioned I usually wave (or signal somehow) to faster rider, even if they would have pass me in middle of lane, i would be fine with that pass, because I expecting that. I do not expect 3000 lb heavy metal object doing close passes when there is an empty lane next to mine, which only trigger huger "red flag" in my head - that person is probably not aware about common sense, and I have no fucking idea if he/she doing to run over me or just want to make a pass.
(didn't get your point about 100mph, and how it related to passing in the same lane - no one was doing 100mph)
So far I'm getting that it's okay to pass motorcyclist in the same lane, because lane sharing is legal... well, good to know.