Sorry and i dont mean to be patronising here if you are a lay person not involved in the law, but the human error you describe simply cannot happen. Going to court is a very long process where there are lots of checks and processes to go through.
What many people overlook is the Stephen Lawrence case is a huge shadow hanging over the Met for many years and much of the issues within the Met we now see is because of that case and they have gone too far the other way. Lest we forget the Met were accused of corruption then, the Yorkshire police were accused of cover ups with Hillsborough, and the Miner's strike in the 80s etc, so it seems naive for people to think in this case there was no corruption just because in this case it was against a person who is divisive.
You’re not being patronising, you’re being irrational. Human error is part of the human condition, you’re not immune from it just because you have a good education and specialised in a particular field. Even in the medical profession there’s a train of thought that you’re not a doctor until you’ve accidentally killed someone through human error.
Not sure how you can claim we’ve “gone too far the other way” either. Surely if we hadn’t have addressed the issues raised by the cases you mentioned old numb nuts would currently be in court. He isn’t, that’s confirmation that the checks and balances work.
It’s also poor taste to use them examples, Steven Laurence especially where putting the wrong date in a box to stop his murderers going to trial was exactly the type of corruption that delayed the Laurence family getting justice.
You also seem to be continually ignoring the fact that numb nuts has gotten cleared on a clerical error, not on the basis of evidence presented in court. This isn’t a miscarriage of justice, unless of course he is actually guilty of what he was accused off in which case he was handed a get out of jail free card by way of a clerical error and a miscarriage of justice has taken place.