Re: aliens will not be friendly
To assume they will not be friendly is just as dumb as assuming they will be friendly. It all depends on how they think and interact with each other and we have no way of knowing any of that.
That said, unless there are very few planets as hospitable to life as ours is (which I highly doubt) and the Aliens need to establish a new home world, I can't imagine why they would bother attacking or enslaving us. They're already capable of intergalactic travel, what does Earth have to offer them?
Also, why do you assume the aliens would be entirely cold blooded emotionless individuals? I'd imagine any race of beings would have to develop a sense of "humanity" in order to survive and live peacefully amongst each other. Otherwise they would just constantly war with each other.
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