I was convinced beyond reasonable doubt, having phone records that matched rather well with testimonies. I also might have fixated on it and ignored chance, but that's why there are 12 jurors.
I'm not sure if a jury is a bad idea, when I first learned of it, I kinda liked the idea, but I'm worried about this kind of reasoning...
Is the decision made by one person that has these same fallacies? At least the risk is spread out some in the jury situation.
The UK uses juries in much the same way as the US does, as do many other countries whose legal systems derives from that of the UK (which are a fair number, because colonialism.)