I am disagreeing with them doing what you say they do.
Also way does every race have to try and win? If there are 4 or 5 that are a real challenge early on and 1 or 2 that are a challenge late in the game why is it silly to have a few that are pushing towards a goal that makes no sense to me. A galaxy of Aliens that think the same is just stupid.
I think we are now just going round is circles where there is a misunderstanding in my point and I do not seem to be able to get it across to you. Therefore I will exit the stage.
I understand what you are saying. However, I also believe you are wrong. If you can't see how a structured victory can be fulfilling to the player then I don't know how else to explain it. Other goals can be fun too, especially ones you make for yourself, but there's a reason why almost every other game ever made has a 'win' in it.
You could have the AI doing it's own thing but if it's not even rationally following it's own interests then it's going to be easy to beat the AI. It gives the player a massive advantage if the AI just won't make sensible moves, if it won't even try to make use of war or diplomacy or politics to stand up to you. How interesting would it be if your fighting game AI didn't block? Not much. Like I said; this kind of behavior makes for great fiction but bad games.