Virtually everyone is against that. Yet war continues to be a part of the human condition, and its incidence has not significantly abated. The study of force involves several major questions. Although much valuable research has been done about the causes of war, about the best we can do is to say that war is a complex phenomenon that seems to have many causes. Some of these stem from the nature of our species, some from the existence of nation-states, and some from the nature and dynamics of the world political system.
Miltary power is both tangible and intangible.
Tangible elements of power, such as tanks, are relatively easy to visualize and measure. Intangible elements of military power, such as morale and reputation, are much more difficult to operationalize. Acquiring military power also has drawbacks. It creates the temptation to use it, it makes others insecure, and it is costly. Some people argue, and others disagree, that spending too many resources on military power is a major factor in the decline of once-mighty countries.