May I once again posit that war is not a natural result of being human, but rather one put upon mankind by strong, selfish, sociopaths that profit from it?
It's a natural result of life, apparently. Go look at some pictures of floppy-eared puppies, or fluffy kittens or fish or trees or algae or fungus: awwww, what cute warlike sociopaths. "You're eating my food, competing for my mate, or claiming my turf? Fuck you. DIE!!" Humanity is the only thing I ever heard of, who sometimes isn't sociopathic.
One can hypothesize a space empire without war, but it would require some extreme creativity. If you have an idea for a warless game, that's awesome, but do you really think war is a far-fetched assumption on someone else's part? I know what planet you grew up on, earthling, so quite pretending you're from some other alien background.