They are murderers and liars. Only in self-defense. Self-defense is reaction to the perception of threat. Forgive me, brother, I cannot raise a weapon against another. I respect your choice.
Killing becomes too easy after a time.
I have seen many good warriors become bloodthirsty barbarians. Because, my honor is pledged with my sword, and my duty is to protect my people. My brother, there is rarely a logical reason for war. Because, it needs to be done. The murderers need to be destroyed.