War affects the whole world. It does not help to have a a war. A tooth for a tooth is not exactly a way to deal even with a bad guy. It will just become a cycle of revenge that can continue for many years affecting lots of lives. Also President Donald Trump threatened to destroy important cultural sites in Iraq. These, I am sure, have religious significance to Moslem people. This, in turn, will radicalize more people from the Middle East and even Asia (Indonesia and Malaysia, and some parts of the Philippines, Thailand, India, Pakistan and even China have a Moslem population). Terrorism will then increase some more. Besides, the Geneva Convention states that any sites which do not have anything to do with military are not supposed to be destroyed during a war. You break the rules of the Geneva Convention, which is the rules of war, then it's free for all. In addition, now oil prices are gonna go up. This, in turn, will increase the prices of goods. At the same time, seeing that Russia, China, and Iran are right now having a military naval exercise, this could also lead to World War III. I am sure if only governments are not allowed to go to war unless their people vote for it in the perfect world, most people would not want to go to war.