Earlier quoted context omitted.
This doesn't really add up to me. If a currently in progress trial is corrupt, we can prevent the harm that a corrupt outcome will cause before it happens. If you have to wait 5 years to discover that the trial was corrupt then we get at least 5 years of harm out of it. Potentially much more because have to retry the case years later will be much much more difficult due to evidence destruction.
It depends if the goal is to satisfy the public that courts are treating this case fairly, or cases in general fairly. One might imagine that if any unfairness is discovered, laws and processes are adjusted for future cases, but past cases will not be re-reviewed.
Because honestly, …we’re way past that point in pretty much every country of the world. People are too demoralized or weak to do anything about it, but just for intellectual curiosity, what is supposed to happen when something abnormal happens in our societies?