Macdonald was acquitted last week of murdering his brother-in-law, Feilding farmer Scott Guy. The trial had unsurprisingly excited enormous public interest: it was a dramatic story full of many of the elements of gripping crime fiction. People were glued to the coverage and few were without an opinion as to what happened and why.
In reality, of course, those opinions were uninformed, or at best driven by reading - or misreading - of incomplete reports of what was said in court. The ideas that people solemnly intoned as fact were, at the very best, second-hand versions of others' surmises.
There was no stopping them, of course. In a case of such drama, public discussion - otherwise known as gossip - is always going to rumble along. But when it appears in the press as a matter of public record, it assumes a credibility that it does not deserve.
Some of the public unease may be traced to the fact that Macdonald faces other charges, the details of which are still to be made public. Whether those charges will influence opinion remains to be seen, but it will not make it any more valid. The only opinions that count are those of the 11 jurors who sat through four weeks of evidence.
The assertion that the opinions recorded by UMR were uninformed is more than a quibble; it is a matter of law. As a society we expect our courts to try matters fairly. We expect the Crown to adduce all the facts at its disposal that might urge a verdict of guilty; more important, we expect a robust defence that will require the case to be proven beyond reasonable doubt (the jury's, not our workmates' or the local publican's). Anyone who finds that problematic might like to consider how they would feel if the Crown had a strong, but mistaken, case against them.
In this case, the jurors were not satisfied of Macdonald's guilt, so they acquitted him. We are all entitled to our own opinions about that outcome, but it does the media no credit when they elevate public gossip to news. Around half of Americans believe that Saddam Hussein organised 9/11 and that God created the Earth.
That doesn't make their opinions worth reporting in the paper.