First of all, Yes. We are descendent of Monkeys. I know some have alternate theories on the matter, but our evolutionary path, either by nature or intelligent design is pretty clear.
Second, All who you are mentioning are people who have grown accustomed to the War as a tool for the state. Just like the Boot Camp is a tool to make war more efficient, so has war made its mark upon politics.
My point is, that our species was developed for competition. When tribes evolved into nation states, this competition was turned into what is now known as modern war. This is true for pretty much all our social values. Morals, Mating, Communication, Appointments. Just as they have evolved but stayed the same, so has War.
I am not saying war is a good thing, but I am of the opinion that I do not think any creature can overcome their nature.