Kill all but the important aliens that can provide information. They've been around for a decade, prospering from the murders of untold numbers of humans and colonisation of a planet that's not theirs. This wouldn't be the time for morality and alien rights. We would need to show them we're ruthless b******* and that they don't want to mess with us. Then we would have to produce the most hideous weapons that our minds can create and deploy them ruthlessly on any non-human that showed its face in our solar system again.
I've read science fiction, I know how this goes down! Hah.
I've read science fiction, I know how this goes down! Hah.