On one of the levels without ww2 and the cold war afterwards — there would never be the Internet and modern computers as we know them [1]
On a philosophical level — as long as there is a dualism, there is a constant battle and interplay between the sides. So war in one form or another is as inevitable as peace.
In a sense the whole life itself is a constant battle between good and evil, chaos and order, entropy and information [2]
On the surface — scarced resources, justice, religions are just silly stories that people create for themselves to sugarcoat and rationalize those (or other) deeply embeded into the reality drivers.
[1] https://www.amazon.com/gp/aw/d/1732265119/
[2] https://www.amazon.com/Into-Cool-Energy-Flow-Thermodynamics/... and other similar books
Also Jordan Peterson “maps of meaning” and any serious book on roots of religious myths and stories.
If anyone is interested in studying the Second Law... this is a much better read than say Jeremy England's "Every Life is on Fire" (which I think disappoints a bit in coming to the punchline.
The essence from "Into the Cool" from the amazon summary: "This second law refers to energy's inevitable tendency to change from being concentrated in one place to becoming spread out over time. In this scientific tour de force, Schneider and Sagan show how the second law is behind evolution, ecology,economics, and even life's origin. "
[0] https://www.amazon.com/Into-Cool-Energy-Flow-Thermodynamics/...