What makes your right to go fast on the left lane more important than their right to go a reasonable ~120km/h in the middle lane?
Nothing, but that wasn’t the created scenario. If the right lane isn’t free, do stick in the middle lane of course (squishing two vehicles together isn’t gonna make them go faster, usually). The scenario created was talking of an empty right lane, which should only exist on the left side, as we should drive on the right side of the road.