kacir,
The fact that some prosecutions are bungled surely does not mean that all prosecutions should be stopped, where there is clear evidence of guilt, does it? There's been a recent very high-profile case in the UK where a man has been released from prison after serving 8 years after being wrongly convicted of murdering a very well-known TV presenter; you wouldn't (I hope) take that as evidence that nobody should be prosecuted for murder?
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