Earlier quoted context omitted.
When a review of a case finds that the prosecution knowingly withheld evidence that actually proved the client could not have been there, the facts pretty much speak for themselves. This should have led directly to criminal charges.
You're focusing on one case instead of looking at the whole thing as a system. What's the standard of proof for establishing that it's knowing and not inadvertent? Who "finds" that the prosecution knowingly withheld evidence? You can't have official legal "findings" until you institute a law suit, so what's the bar for instituting a law suit and how do you set that bar high enough to keep prosecutors from being inund…
I disagree that this is simple cost-benefit analysis. This is about the integrity and trustworthiness of the system, and it's not worth writing off a whole bunch of people to make the wheels squeak less and clean up easier when they grind up an innocent person's life. It needs pressure from the outside to reform itself from within.
EDIT:
I guess I'm asking for the justice system to do a better job policing itself and start treating transgressions like this as major offenses that threaten the system itself. But considering human nature, this is unlikely. There is an interesting book called 'Mistakes Were Made (But Not By Me)' which has a chapter dedicated to this kind of behavior in the justice system.