Mate you know nothing about the official or the "gentleman's" rules of motor racing.
As someone who has raced sprint karts and is from a family of generations of motor racing competitors, officials and enthusiasts, I can tell you that Murphy was well and truly in the wrong.
For a start, Murphy screwed up the previous corner, and Ambrose rightly overtook him, with the intention of claiming the next corner. There was no way that Murphy could challenge for the next corner without planting his foot, late braking, and ultimately not making it around the corner.
With that in mind, Ambrose had every right to believe it was his corner, and drive accordingly. He had given Murphy plenty of room by taking the wider racing line even earlier than normal. Instead of easing off slightly and hugging Ambrose's tail, Murphy let the red mist descend and basically just drove into him.
He should have been fined, as it was clear that it was his fault. Racing accident? I don't think so.
...and I'm a Holden man.