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Consider the most convenient world in which the bond is actually verifiably true and verifiably used at most once.
In that world we'd still heavily object to such replacements. One reason for that is that being able to kill _a person of your choice_ is a very potent way to do blackmail and thus get others to do your bidding.
So, let's consider the case where the killer can kill a person chosen uniformly at random. At this point I'm unable to argue convincingly in either direction without employing dirty eristics.
