" This is the moral, Oh My Best Beloved: never kill anyone for a 'Cause'.
For why not, Uncle Basher?
Because causes don't pay, Little Friend of all the World. Adherents expect you to kill just for the righteousness of it. They don't want to pay you! They don't understand why you want paying! "

― Kim Newman , Professor Moriarty: The Hound of the D'Urbervilles