Yitz, see Hilchot Melachim 3:10 that the government can execute people without these evidentiary rules and even without clear evidence and even someone who is not liable to the death penalty such as an enemy who killed inadvertently in order to fix the world.He can even kill many in one day and leave them hanging for many days in order to instill fear and break the hand of evildoers. He can eevn execute people for minor offenses if need be (ibid Halacha 8). I refer you again to Shmuel Bet 1:10-17. As for the slippery slope argument, this is a logical fallacy. You can say that if one is allowed to kill an animal for food he will come to kill a human for fun. It simply does not hold water.
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