Deep down inside, humans and their packs love war. From Fred Reed at unz.com:
There is no limit to misjudgement. If the psychic curiosities in the Federal bunker start a war with China, or push Beijing into starting one, it will be blamed on a proximate cause, such as a collision of warships after which some lieutenant who joined on waivers lost it and opened fire. After all, historians have to write about something. The causes will actually be deeper and more complex.
To begin, people are cerebrally arranged to form groups–“packs” is a better word—and fight with other groups. This is dimwitted, but so are people. The urge manifests itself in wars, political parties, football, teenage gangs, and contract bridge. It is not rational. In football, armored mercenary felons having no relation to the cities they represent, battle other felons from another city, most of whose citizens would not let their daughters within a parsec of said felons—all this while the fans scream in adrenal murderousness. It is just what we do. At the national level, it is called “patriotism.”
Territoriality is part of the disorder. Human minds—the phrase may be an overstatement—seem intended for small wild groups for whom protection of hunting grounds might be important. When a Secretary of State embodies this instinct, he may, for example, confuse Asia with a patch of woods rife with deer. An instinct well suited to one situation is applied to another to which it isn’t.