Nice, all laws are abused to a certain extent, but the odd Loony Example doesn't justify throwing out the whole shibang.
i think you misunderstand.
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Some ECHR decisions do seem to be very poor.
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however some of the "loony" decisions are less looney and more reasonable when the full facts are known.
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The prisoner votes issue seems to be a silly one, except (AFAIK) the ECHR only says that the blanket ban on every prisoner voting is unlawful, not that all prisoners should vote. E.g. someone in for 14 days for contempt of court can't vote if that occurs over polling day. The UK gov has dragged it's heels on this one, probably because it sounds bad politically to "give prisoners the vote" even if it was actually "give some prisoners the vote".
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When a group of prisoners sued the uk gov in the ECHR over this they won, but the ECHR declined to award any damages (which is probably what they were after).
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But effectively leaving (because by making a national court superior to the ECHR that is effectively what you are doing) the HRA we are taking a step in the wrong direction. China stays within it's legal framework when it arrests and executes people. So did Burma, Zimbabwe, Apartheid South Africa and pretty much every Human Right violating state in history.