There is one fairly good reason for fighting - and that is, if the other man starts it. You see, wars are a great wickedness, perhaps the greatest wickedness of a wicked species. They are so wicked that they must not be allowed. When you can be perfectly certain that the other man started them, then is the time when you might have a sort of duty to stop them. 
T.H. White, The Once and Future King
evil, fighting, right, war