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Often people use those lanes to speed. If a car ahead is overtaking at or within a reasonable range of the speed limit, but not at the speed the speeder wants to travel. The speeder must be patient, they don’t get to dictate what manoeuvres are happening ahead.
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The argument you present at the end isn’t logical,
… Always do the safest thing.
I can largely agree with this sentiment, but you say before,
People who sit in lane 3 at 69mph are breaking the law and likely to cause an accident by forcing people to pass on the wrong side out of frustration (yes illegal but they will do it)…
If undercutting is the most unsafe thing for the person behind to do in the situation, then as your sentiment captures, the frustrated party undercutting are still in the wrong.
They are in the wrong because, they have failed to ‘always do the safest thing’ in the given situation.
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Never be the reason someone else does something stupid on the road.
Nice sentiment again, but it implicitly assigns a rigid cause and effect regime to a situation where the ‘frustrated party’ behind has their own agency and likely as much training. There is no necessity that they undercut, it is a choice the party behind makes. The cause does not necessitate that effect, at best it could contribute.
In essence the sentiment shifts the blame from the person causing a potential accident (the undercutter), to the person ahead who, at worst, is causing poor traffic conditions.
A roadway allowed multiple speeds across the lanes could be how to get around this.
If the citizens of a transport zone don’t like the rules as they stand, ie, one single speed for all lanes, they should lobby to vary them.
Apart from cases where multiple speeds happen, the speed limit is the speed limit, the person behind contravenes rules if they speed, use the shoulder, etc. They’re in the wrong, they have agency, and decide to cause the unsafe situation.
The person ahead, as that video showed to the tune of straight funktown, may cause worsened traffic conditions, but they’re not the people being dangerous on the road. (Assuming they are going within the range of the expected limit)