Person A wants person B to die. Person B is in a relationship with person C and is having an affair with person D. Person A knows about the affair and believes that person C will kill person B if they find out. Person A brings proof of the affair to person C. Person C kills persons B and D.
Edit 1: Person A is not asking Person C to commit a violent act, or suggesting that they do so. They are informing person C of the affair in the hope that Person B will be killed.
Should person A be punished for their actions? Why and what is an appropriate punishment/factors that affect an appropriate punishment? This thread is not intended to discuss punishments/reasoning for persons B, C, or D, only for person A.