What laws would need to be changed to allow legal hunting of pedophiles?

Putting aside any moral apprehension or hopes of rehabilitation, how could it be possible for citizens to legally hunt and kill pedophiles? Would this require a decision from the Supremes, a Constitutional change, or could it be a state-by-state decision?

Are there any countries where this is already legal?
To clarify, I’m specifically talking about convicted with DNA evidence and confessed pedophiles. I’m not interested in being the thought police. I do like the idea of reclassifying them to something other than human.

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