Although somewhat unusual, evolutionary psychology can also explain conflicts in politics and the international society. A journal article by Anthony C. Lopez, Rose McDermott and Michael Bang Petersen uses this idea to give out hypothesis to explain political events. According to the authors, instincts and psychological characteristics developed through evolution is still existent with modern people. They suggest human being as "adaptation executers"; people designed through natural selection, and not "utility maximizers"; people who strive for utility in every moment. Though a group of people, perhaps those who are in the same political coalition, may seem as if they pursue a common utility maximization, it is difficult to generalize the theory of "utility maximizers" into a nation-view because people evolved in small groups. This approach helps scholars to explain seemingly irrational behaviors like aggressiveness in politics and international society because "irrational behavior" would be the result of a mismatch between the modern world and evolutionary psychology.