I just can't picture Humanity stepping out into space and kicking the shit out of everyone else. We're violent when we have something to stand up for, yes, but we also got to where we are by knowing how to pick our battles and by not rushing in to combat against potentially superior foes. Along with that, our media has been quite interested in the idea of advanced aliens for far, far too long for us to be widely comfortable with starting battles with aliens as one of the first things we do. I think most of humanity would try to approach the aliens peacefully. I think a mix probably sounds good, as Sheik said.