I was wrong, the Iranians did shoot down the Ukrainian flight. It wasn't a mechanical problem, it was a hostile action. In addition it looks like a growing number of Iranians want to see the supreme leader out for his role in the atrocity. Though I do expect the officer who authorized the firing of the missiles is likely to get executed for his role in the matter.
Now my confession is nothing big when you get right down to it, but I was wrong and it's up to me to correct my mistake.