Unless some effective supranational government can be set up and brought quickly into action, the prospects of peace and human progress are dark and doubtful.
Never, never, never believe any war will be smooth and easy, or that anyone who embarks on the strange voyage can measure the tides and hurricanes he will encounter. The statesman who yields to war fever must realize that once the signal is given, he is no longer the master of policy but the slave of unforeseeable and uncontrollable events.
When you're 20 you care what everyone thinks, when you're 40 you stop caring what everyone thinks, when you're 60 you realize no one was ever thinking about you in the first place. You have enemies? Good. That means you've stood up for something, sometime in your life.