I can agree somewhat with your first paragraph, but "ourselves" is rather nebulous. I'm not in Iraq, Afghanistan, etc, and if I were, I certainly wouldn't identify with the men who sent me there. There are 6.8 billion of us, which makes it kind of hard to lump us all together as "vicious and aggressive."
Evolution is neither. It does not have any such personality traits, and there are plenty of examples of symbiotic behavior in nature.
We just fill the gaps. If there's a niche to be filled, and an extraterrestrial species can fill it at our expense, then so be it.
Evolution is certainly aggressive, and rewards aggressive moves. It's all about being able to better use the resources at your disposal as a species to gain an advantage. There's no sense of right or wrong in this selection process - if you proliferate you live on, if you don't you become extinct. There are certainly examples of symbiotic behaviour, but only so long as both parties have an advantage of the relationship. There's no free lunch.
This also goes for infighting among our own species - one tribe continually tries to gain an advantage over others. Just look at global politics to see that this isn't about being fair only about expanding your own territory and power. If you look at what historically happens when a less civilised tribe meets a more civilised (and better armed) tribe it's pretty obvious. The Mayans, aboriginals, eskimos and native American indians have all been exterminated or marginalized in the most vicious ways.
"It's all about being able to better use the resources at your disposal as a species to gain an advantage."
Of course. I'd prefer "efficient" to "aggressive", though. True, the literal definition of aggressive does fit, but seems to imply intent (or even malice) in common usage, neither of which are possible attributes of evolution.
"Just look at global politics to see that this isn't about being fair only about expanding your own territory and power"
This returns to my point. I'm not a politician, and using the behavior of politicians or generals to predict my behavior is specious. Yes, we are a competitive species -- I made comments to this effect further down the page. I don't think we fundamentally disagree. I only object to the characterization of the "wars in iraq, Afghanistan, Somalia, Palestina, etc" as somehow indicative of the fundamental nature of life in the universe. As I and others have commented, we don't have much to go on in that arena.
Evolution is neither. It does not have any such personality traits, and there are plenty of examples of symbiotic behavior in nature.
We just fill the gaps. If there's a niche to be filled, and an extraterrestrial species can fill it at our expense, then so be it.