I don't think I've expressed this at all well; I now see the problem Judith Butler has... dd
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Yes you have. There is just the final point missing, that whatever William's actions and reasons, the state isn't supposed to be the Biggest Gang of all, and therefore completely free to execute whoever it can make a case against. In effect, performing state executions shares the same amoral world view as William's was alleged to live, which comes down to the power to do so: the power of one body to erase another.
Pretty much the same argument from power is applied by the state to determine who can have an abortion, who can decide to kill themselves, who needs to be tortured and so forth. In other words the state reserves its right of power over all bodies to make all the basic determinations of human life, custom, sex, and death.
CG