Lunatic tangent? In the U.S., when innocent people are proven to have been convicted unjustly, it often comes to light that prosecutorial misconduct of one kind or another -- withholding evidence, doctoring or misrepresenting lab results, intimidating witnesses -- played a big role in their original conviction.
I'm quite familiar with the problems in the US system, I have participated in a number of threads here dealing with US cases that are/may miscarriages of justice.
What makes you think there'd be no misconduct if the loser had a second chance?
Well firstly the UK doesn't elect prosecutors, law enforcement and (especially) judges, so there's less tendency to the mob rule one sees in the USA.
Nor is execution (which doesn't exist in the UK and the rest of the EU) the political issue that it is in the US.
Secondly,
as I already pointed out, the prosecutor (in fact the Director of Public Prosecutions) has to demonstrate to a court (of unelected judges) that sufficient evidence to satisfy the specific terms of the Criminal Justice Act 2003, i.e. demonstrate evidence of serious misconduct of the trial or that significant new evidence exists.
If you want to claim that UK prosecutors -- whatever their title -- never bend the rules to win, you're welcome to do so, but I suspect evidence to the contrary wouldn't be hard to find.
You, really, really don't know me if you suggest I hold such a ridiculous opinion.
And if a court proclaims "this is such compelling new evidence that we need to try this guy again," it's tantamount to telling the jury that the first verdict was wrong.
No, it's not. Further I suggest you examine the
standards for the new evidence; for example even a plea of guilty to the offense of having committed perjury at the original trial has been rejected as insufficient.
It has to reduce the possibility of a fair trial by an impartial jury. Jurors know there won't be a second trial if the new evidence helps prove the already-acquitted guy is still innocent.
So why, if they're so prone to jumping to irrational conclusions, bother with
any jury trials?
Sometimes people do get away with murder. That's terrible, but it would be much worse if innocent people can be hounded forever.
Sigh. Your hyperbole about people being "hounded forever" is just silly; the change in the law is specific and subject to reasonable safeguards. Not least is the infrequency of its use and the attention when it is invoked.