Earlier quoted context omitted.
I've always been confused by this proposition; If there is an innocent person convicted of a crime, then there also has to be a guilty person that has gone free.. so it seems the ultimatum has to be "are we are willing to let a guilty person go free rather than let a guilty person go free and an innocent person go to jail." Which has a much more obvious answer..
That's assuming a hypothetical crime actually happened in the first place. In many cases it's possible that no crime ever happened . (For example, if the man in the article never actually had child porn that doesn't mean someone else did.)
Although, thinking about it from the point of view of someone being Convicted of a crime that never happened is fair enough, But when someone is not convicted of a crime that never happened we are not 'letting a guilty person go free' so both options in the ultimatum are broken with this.