Like Nordmann, I am not very interested in the strategic bits of war and indeed don't really know how a gun operates, barely having held one. War shows up dichotomies like courage and cowardice (though I don't really see why cowardice has such a bad rap, really), idealism and cynicism, illusion and disillusion, enmity and mateship, empathy and indifference, greed and sacrifice, etc. I have been fascinated in the WWI oral histories I have been reading to see how quickly the young men were able to ignore dying people and at the same time fight bravely so they didn't let down their comrades.
The other thing, of course, is that war is so omnipresent in current affairs and historical events and stories; you can't really get away from it. So in a way an interest in it is forced on you.
But there are people who only find ugliness in war and can't bear to watch documentaries or films focusing on it. [How do you spell focusing? I always want to put two 's'es in it, but the spellcheck objects; however it is American - the computer refuses to keep it on any other spelling for some reason - and maybe this particular spelling of focussing is too.]