If you are a power hungry dictator, who wants more the answer is yes. If you are a person under such an evil sob, the answer is likely yes. If you are one who thinks the killing of people can never be justified under any situation, than the answer is no. And you must stand by as Hitler exterminates the Jews, and takes over all of Europe, and just accept it is what it is.
My personal choice, War can be the better of the choices available. like it or not we don't live in a yellow daisy, bubble gum world.