You said, "The death of one person will not change a thing" Your exact words. Those deaths changed a lot. The death of one evil person who is an enemy is invaluable to our military. It is a HUGE loss to the other side. With him goes years of built up trust and support and knowledge. Yes, they can replace him, but until he builds his own base of trust and support and gains the knowledge, he will not be as effective. He also can be taken out.