World War II vs. Vietnam
Throughout history, people have had basic images of different wars. Vietnam has always been perceived negatively, whereas WWII has been represented in a glorious, positive way. In Slaughter House Five, Kurt Vonnegut presents them as both being equally unnecessary.
At any point in the book where somebody dies, including the war parts, he simly says: "so it goes." I agree completely with Vonnegut. War is the most senseless thing the human race creates. I can not think of one good reason for it. Even if the United States "wins" a war, thousands(sometimes millions) of Americans and other people still die. How is that justifiable?