The rules of racing (2014)
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Since the article is from 2014, it only shows the first chapters of the years-long Hamilton v Rosberg battle. The issue there was that Rosberg was treating Hamilton like a teammate, trying not to crash and trying to race him as fairly as possible in order to avoid a crash. Hamilton didn't ever do this. When he felt threatened, he raced against Rosberg in the same way he would race any other driver from a different team. Rosberg crashing into Hamilton in Spa was a way to tell the team that Hamilton needed to be fairer and not force dangerous situations, or Rosberg would stop being fair to him. Hamilton never changed his attitude, and Rosberg started being way more aggressive in the following races. Finally, in Spain 2016 both cars crashed hard into each other and had to abandon. Rosberg ended up winning that year's championship.
A trait some of the great drivers share is that they completely disregard teammates. Schumacher, Hamilton, Verstappen, Vettel, and Senna are or were like this. Prost and Rosberg did something rare, they were quick enough to accept their teammates' challenge. Is rare for teams to have two best-in-class drivers.