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It is pretty simple to model the two scenarios and realize that the person going more quickly generally impacts less people.
The impact on traffic is not the same as impact of safety. In all my driving on all major Canadian highways, mainly in GTA, I never saw a guy in the right lane, going slightly slower, cause an accident. But I see plenty of speeders that are on the lookout for the next empty spot to hop into, rear end the car in front of them because the traffic slowed down.
I agree that big speed differential is a major factor, no matter slow or fast, but a guy slowing the right lane ( I’m talking 5mph or so slower) is far safer than a guy hopping from lane to lane, disturbing all lanes, tailgating and generally not keeping a safe distance.
I know, same here will reply "I am very aware of my surroundings when I do that, blah, blah, blah" I heard this a million times from a bunch of people that think they have lightning reflexes or are the next Schumacher, but guess what, it's not just you on the road, other people trying to change lanes may not see the "lane hopper" in time, and as already mentioned, most drivers do not have the skill to handle avoidance maneuvers at high speeds and this kind of behavior will lead to a situation like that eventually.