Crazy how they just refused to believe (or properly assess whether it was true) that the software could have any issues, despite having reports of errors starting very soon after it went in. I find it extraordinary that they secured convictions despite the fact there wouldn’t have been any unexplained wealth or any money popping up elsewhere - although it seems in a lot of cases solicitors basically convinced the postmasters to make false confessions (kind of like plea bargains I guess).