What are some reasons why disharmony is not the main cause of war.

( Remember that we have to do the process of elimination of things that really arent the main cause of war to we get to the root principle which is going to be fear)

I understand that disharmony is a lack of harmony where people disagree about important things anc cause an unpleasant atmosphere.

Disharmony and unpleasant atmospheres do not cause wars. There not the intensity of feelings involved in disharmony to lead to war.