Sent To Jail Because of a Software Bug

First time accepted submitter toshikodo writes "The BBC is reporting a claim that some sub-post office workers in the UK have been sent to jail because of a bug in the accounting software that they use. The Post Office admits Horizon computer defect. I've worked on safety critical system in the past, and I am well aware of the potential for software to ruin lives (thankfully AFAIK nobody has been harmed by my software), but how many of us consider the potential for bugs in ordinary software to adversely affect those that use it?"