All life is a struggle for existence. Why should it cease to be a struggle if it spreads among the stars? — Ken MacLeod

It’s a big coincidence. It’s something we can’t explain. But as far as we know that’s all it is. And if it isn’t, we’ll only find out by discovering more facts, not speculating, no matter how logical that speculation might seem. The way to learn the world is to look at the world.

Falling in love indicated that your genes were complementary to those of the loved one. It told you nothing about when your personalities and sexualities were compatible.

I can’t really imagine war. I can imagine having to fight some swarm of zombie machines or snarling horde of posthuman fast-burn wreckage or whatever, but not two or more actual human societies actually fighting each other. I’m aware that people did that, before history, before the Moon, but it seems irrational. One side would have to believe they had something to gain from destroying or damaging the other, which just doesn’t make sense: it runs up against the law of association. And more to the point, each individual on any side would have to believe that they benefited from participating even if they died, which doesn’t make sense either. I suppose kin selection could make genes prevalent that made people vulnerable to that kind of illusion, but that only makes sense with animals that don’t have foresight. Even crows aren’t that stupid, at least not the ones that can talk. You have to get down to ants and such like before you see that kind of genetic mechanical mindlessness.