I liken it to the waves on water, or even the ripplies that the spice helps us see. All the ideas and concepts string together with similar ones to form waves with momentum, and war is a byproduct found in the crests of some of the highest waves. In this way they bring with them some great ideas, that may have otherwise great intentions, but also like a wider spreading solvent impure ideas that are not so good. Ultimately, they will all be solved out when equilibrium is reached - but this is an active wave-pool constantly churning. In this way these larger waves, resulting in war overpower our smaller waves trying to bring peace and help to the world. In this way these larger waves engulf mass physical materials as in the first two World Wars and crush even vaster psychological and immaterial reserves such as in our modern day with the wars on drugs and terrorism(or whatever it was renamed to) and such, crushing the very hope of eventual victory that war once promised. The waves that involved Hitler and Stalin did much harm, but also much good and teaching. I view it that they were unfortunately necessary - everything is happening exactly as it has to. I am a programmer of video games, and looking at just the Red Alert series itself, and many of the real time strategy games in general, and you can see how their stories all require the specific makeup of everything that happened just as it did. Sorry for that aside into such odd territory, but that serves as a good example of how even deep cracks in the most fringe-est of things was deeply affected. So this wave too is bringing good and bad, and is a wave with War present in its makeup. The war cannot exist without the good and bad ideas that provide it a foundation to form under, but it is presumable we can try and minimize the bad and maximize the good. The War itself manifests in violence and death it seems, and we can see how mankind has tried every possibility - from random killings, to willingly lining up, to sacrificing our own so that noone else must suffer (say a volcano God will get angry, to follow a common stereotype), to anything else. We've managed now to hem it in to an amazing point that we ALL accept will never end - similar to the sacrificing ourselves, but at massive costs to ourselves and maybe our entire collective - as technology has allowed us to amplify these waves to absurd amounts. As someone else mentioned, our society is heading to the realm of where it is sanctimonius, a rite of passage to do your part in fighting the unnamed foe that variable Other is chosen to represent by our opaque masters. That is the key difference, the old masters were transparent - I wonder if during some sacrifices many substances and religious miracles maybe even were happening - what if that was some way to restart life into a slightly better one, another, more physically real, sense of being born again. It would be obvious that this knowledge would be lost once the collective belief in cyclical and reincarnative ideas were lost. I'm not condoning sacrifices or anything, just saying the technology for any meager sense of the reality of those presents is irretrievable. You could have ten people write about an event, but as we can see ourselves transparently through the spice, those events will merely be shadows of the truth. Each observer who wrote, the subjects they wrote about, and every other witness all experienced realities of what we can only presume were the exact same if not moreso intense reality that we experience in the phenomena of being alive. The whole idea of the natural earth's gauss field being stronger then might even actually have some interesting weight to it then?
I'm just ranting, dunno where I'm going with this. I think my point is that war IS good for evolution, but in a sense that is evolutionarily-based itself. It is a similar phenomena to us and everything else, an essential byproduct of reality. For such good to exist, we need the bad of war. If we never died, and were invulnerable, then here's a quick slightly unrealistic stretch: Two people meet each other, one stabs the other with a sword, the other slices his axe into the other's chest, they burst out laughing - but they experience the exact same as if two people in our world embraced each other in a hug. Since death is no factor, nor pain, then penetration of their body is also no factor, and could even be attributed to humor if nothing else, for the same reason that humans have that constant humorous eye that sees something odd, which has proven itself still existing in our consumerism consumed world in the form of mass produced hats with a fake arrow going through the wearer's head. "Look at me, there is an arrow through my head!"
In less 'trivial' ways, War serves as a printed, stained image on the mind. Watch Grave of the Fireflies, or listen to The Wall. These experiences would only be possible through, mayhaps, a meteor? Which as science as taught us, have interesting abilities to jump-start life in ways that are counter intuitive to what one originally thinks. (Smashing, fire, but there is ice in the makeup!) War gives those in charge more and more hubris and foolishness until they eventually destroy themselves, it is part of the equilibrium system itself, righting things out through whatever means necessary - the only constant that the means is always awe inspiring, assuming it is God, or Us.
Okay I'm done rambling ..again.. damn Alan Watts got me going! Oh and this is all just my two cents, and pretty stream of consciousness, but I'm sure you figured that out by now
Note also this was all based on reading the thread, haven't actually watched the video yet *blush*