GEN725 Although a man inciting murder escapes the death sentence at the hands of a human court [since he himself did not actually commit the murder], there are legal mechanisms in Judaism by which to deal with such a person.  It is within the purview of the Jewish king [Maimonides, Hilchot Rotze’ach 2:4] to take such a person and kill him, if he so desires, and even the Jewish court, in a one-time action, may put this murder inciter to death if they feel it is necessary.  However, even if the king or court do not kill this person under this special allowance, the court is obligated to beat this murder inciter “to within an inch of his life,” just short of death, jail him for life, and generally make his life as miserable as possible, in order to deter anyone else from causing or inciting similar crimes and sins.  Ibid 2:5.  AMEMEI 119