I'll get flamed but oh well...
I'm not suggesting the professional driver was legally obligated to do anything different, or even morally obligated to do so, but I do believe he should have seen this coming. First time I watched it I could see right away what was going to happen, just by the way the RV was closing on the other truck. The pro driver has better visibility from his cab than we do from a dash cam. He just chose to stand his ground and maintain speed. There was a time when professional drivers would do everything they could to avoid this kind of thing, even when the other drivers act stupidly.