Wolf
What did they do with a ???? who killed someone who turned out to be a ????? ? there is no ???? ???? but he still is a danger to society. If you find an answer to this question yours is answered as well.
RR wrote;
An answer to the Wolf’s question would be that there is no Halachic action on this person, but there are societal actions to be done. Just as setting up traffic rules and patterns are the responsibility of any government, it is not a Halacha per se (besides for Vinishmartem, Lo Saamod, Vechay Achicha Imach…).
perhaps that was the function of ???