Nevertheless, studying international relations theories allows to have a better understanding of international politics, make sense of institutions and other events which take place in the world. For example, the atrocities of the two world wars, can be theorised in different ways. Depending on what dimension theorists are looking at:
Realists may argue that the reason for war was the struggle for power; as they believe that, states behave in a self-interest manner because the world is anarchic and states have to position themselves within that system.
Liberals may say that, the lack of local and international institutions or international governing body, was the cause of the conflict; because they argue that states alone can not maintain peace without a international body.
Structuralism would argue that international relations has been shaped by minority capitalists in order to expand their economical ends in exchange of cheap labour from the majority of workers. They believe that capitalism is unjust social and economic order which causes conflict and disharmony between states.
However, both theories seems to present some substance, it is necessary for international relations scholars and students to continue to make analysis and extract a convincing picture of how states behave within the international structure in order to find mechanisms that can prevent future wars.