There's no subject more fertile for debate than hypothesizing about the nature of extraterrestrial beings.
So, in a study carried out by NASA and Pennsylvania State University scientists ("Would contact with extraterrestrials benefit or harm humanity? A scenario analysis," arXiv:1104.4462v2 [physics.pop-ph]), several intelligent extraterrestrial encounter scenarios are examined. One of the scenarios is a sci-fi favorite: what if we encounter an alien race hellbent on destroying us?
But this isn't mindless thuggery on behalf of the aliens, and they're not killing us to get at our natural resources, they have a cause. They want to exterminate us for the greater good of the Milky Way .... http://news.discovery.com
