In the ideal scenario of lane straddlers, everyone trying to enter a particular lane at a particular point has to do so at the end of the line of people already

In the ideal scenario of lane straddlers, everyone trying to enter a particular lane at a particular point has to do so at the end of the line of people already waiting to enter. The right hand lane is completely unused and therefore the length of the line is double what it needs to be, possibly so long that it interferes with other intersections. In the ideal scenario of zipper merging there is no free right hand lane to shoot ahead in: it is completely filled with people that are alternately taking turns with the other lane to enter the merged lane. The queue is half the length in this case then the prior case. The lane straddler doesn't feel taken advantage of since everyone is entering the queue in the first available location (left or right). Lane straddlers perform an illegal maneuver (I assume intentional driving in two lanes is illegal in most countries) to pre-empt the more efficient usage of the road. Their righteousness is unjustified: the person that would otherwise pass them in going to the front of the lane would be increasing the utility of the road. They would be more considerate by entering the lane they are blocking and going to the front themselves.