Have to be careful that miscarriage of justice doesn't always mean someone's innocent, but yet, after the fact when new stuff comes to light, it all looks clearer - obvious in a way, but without that crucial evidence or new testimony, it's very different... AND we often forget 'the times' in which things happen. It shouldn't matter, but it does. Public mood and acceptance of certain crimes changes over time....
I'm certainly not saying withholding of information is always good, but I am saying there are sensible reasons why PII exists. But as soon as you offer a 'shield' to protect good guys information from the bad guys, you also afford the bad guys to hide information from the good guys.
If those guys hiding things convince a court to let them keep it hidden, it's a mess.
On the positive side, the fact that some people DO get acquitted, even if after many years, it gives hope that the justice system can, on occasion accept its fallibility. Although sometimes, the 'system' fails, more often than not, it's the people that fail it... the bad guys cheating the system, and not the system itself.
But still, the system tries to catch those culprits whenever possible.
Sometimes, it can feel like it takes 20 years for the 'old regime' to lose power, and a new regime to come into power (e.g. a police force) that no longer fears dirty laundry... since it wasn't on their watch, and they feel more able to expose the past. IF that happened in EP, then I truly hope people will see fit to reveal the truth after all.
If however, Bamber turns out to be guilty after all, then he may well fall into the same category as Ian Brady, who knowing full well he'll never see freedom, still seeks to withhold the truth from victims and quite possibly took pleasure in that.