No rules can always be the safest option as situations vary. This was a chain of errors which ended tragically. The first error was a rule mandating that you move over if that is possible, which in this case it was. As this was clearly the single thing which led to everything else happening fault must be assigned to that rule, and indeed to any hard and fast rule which might lead to a less safe situation.
1- The trucker should have moved over sooner as there was visibility and time to do that. However he might have thought that moving over sooner would prompt the camera car to change lanes making that a less-safe option. Or he could have been lackadaisical about it all. Since we can't know their intention or thoughts, the only fault I can assign them is that they did not leave as much room between them and the camera car as they should have before moving over. Still, there was enough space so that the camera car did not need to take emergency action; though some braking would have been needed. Very little wrong if any by the trucker whose greatest sin was in not moving over sooner.
2- When the camera car saw the truck moving into the fast lane with a signal, and no slower traffic ahead of him causing this, they should have known that something odd was happening and slowed until they determined what that was and whether returning to their previous speed was safe once again (if indeed it was safe to begin with which we do not know). The camera car driver is too stupid to be driving, and there is much fault in that, however until intelligence is mandated before privileges are given this is perfectly legal. An equal share of this fault goes to the system who licensed them to drive when they never should have.
3- The camera car should not have changed lanes. First, they could not see far enough ahead to safely do that because they hadn't slowed down for the truck moving over. Second, they went past the lane limits and onto the shoulder which should have never happened. Third, they braked when they should have steered when the disabled vehicle became visible; they made no serious attempt to avoid the ensuing crash when they could have.
4- The people with the disabled car bear some fault here as well. They clearly knew they were in a dangerous spot and they should not have failed to be watching the traffic as it approached so they could at least hope to jump to safety if that became necessary. Instead they stupidly remained in harms way and it bit them.
If not a murderer, the driver of the camera car is a reckless and wanton killer. They do not deserve a place in our free society ever again. Whoever was involved in licensing them should be fired, and should never be allowed to hold any position of trust ever again. The trucker deserves a ticket for an improper lane change and to be made to watch this video if they haven't seen it already so that they are more diligent if this happens to them again. The poor souls with the disabled car have paid dearly for their contribution, but should be made to understand that there would have been no tragedy, only a crash, had they acted more sensibly.
We as drivers are ultimately responsible for the safe operation of our vehicles, regardless of what rules or laws must be broken to have this happen. We are also as responsible to do our best to not cause a loss of safety to other road users whether directly or indirectly. It is a great and grave responsibility we have and it should be treated like that by those granting driving privileges too. Deciding fault and giving punishments afterwards is a poor substitute for not allowing the problems to occur in the first place. Better can be done, but nobody is doing it and therein lies the main fault of this all.
Phil