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I don't think anyone is arguing that not being able to impose the voters' will over the laws of nature is any indication of whether a system is democratic. Nor should not being able to vote away natural rights (like the right not to be murdered) have any bearing because they're basically the same thing. Red herring, really.
If someone who is long gone (and no longer has voting rights) imposed limitations on a democratic system then how is it even a democracy? More like a dictatorship ruled over by dead people with the illusion that people have "self rule".