Since Australia severed legal and constitutional ties with the English Privy Council the role of English precedent has been diminishing and there has been a move towards statute law. Australian law now depends almost exclusively on Australian precedent, with recourse to the High Court of Australia. The Supreme Courts in each state are bound strictly to decisions made by the High Court of Australia, even if they believe those decisions are wrong. The only court able to overturn those decisions is the High Court itself, although it is of course reluctant to do that. The lower courts in Australia are also not bound by everything that is said in a judicial decision or by all of the judicial observations of a higher court; rather it is not the case that binds a lower court, but the rationes decidendi, according to Justice Michael Kirby, (Precedent Law, Practice and Trends in Australia, Australian Bar Review, December 2006). I therefore don't believe a legal precedent is solely due to an appellate court publishing an opinion "after reviewing a decision by a lower court"; binding precedents are just that, but persuasive precedents are not. A precedent given by a court to which there is a right of appeal from the court in which the precedent is cited is binding. Therefore a decision by the High Court of Australia is binding on the Supreme Court of each state. But all other decisions are said to be persuasive, for example a decision of the Court of Appeal in Queensland is not binding on the Supreme Court of Victoria. I also noted that Superior court decisions which contribute to the body of precedent are those dealing with a new set of circumstances that are sufficiently different from past cases such that they warrant a new reason for a judicial decision; such cases contributing to the common law are of course recorded in recognised law reports. I would argue that this case does meet the criteria, being sufficiently different from preceding cases, and therefore setting a precedent. Whether that is upheld is another matter, as persuasive precedents are not mandatory or binding until adopted by a higher court.
So basically we've gone from "he's guilty of murder" to "he's guilty of manslaughter", to we're not sure what crime he's committed and therefore the sentence isn't warranted? That's quite a shift in attitude. In my opinion as he pleaded guilty to manslaughter of his own volition, and that is the conviction that has been recorded against his name, I'll live with the Court's decision. My other remarks were regarding K_girl's questions as to my own concerns regarding any precedent in this case being used against another diver (see above), and had nothing to do with my view of Watson's guilt or innocence. I still believe the Judge had access to all the information necessary to sentence after reading his remarks and other information from various sources, and until someone can prove otherwise I'll continue to believe he made an informed decision.
May I add that the Court of Appeal is only looking at this case to ascertain whether the length of his sentence was appropriate, and not to overturn the decision.