It is preferred to live in a zombie apocalypse then an alien invasion apocalypse

1. Okay, I'll admit that we're bigoted self-centered xenophobic jerks, but that doesn't justify the risk and cost of extermination. Also, we just might be doing the aliens a favor by not inviting them to take part in beauty pageants. .. Anyway, bigotry is stupid--it involves classifying an entire group of people in a certain manner based on what had always turned out to be inaccurate information or fallacious reasoning. Since these aliens want to kill us all--not just are willing to--we must conclude they have an active hate for us. This means that they are either bigots (which means that they are rather stupid) or they enjoy inflicting violence. If they enjoy inflicting violence, there may well be other aliens who track their movements and attempt to intervene.2. I'll drop this argument. Count it as a concession.3. In a zombie invasion, though, you've got to kill all of them--that's because of the basic nature of zombies. They are a virus and must be exterminated. Aliens, however, recognize their own mortality, and the expense of trying to exterminate us. As pointet in Falling Skies, if we are sufficiently inconvienent we dramatically raise the chances of the aliens deciding the whole idea was stupid and going home. Remember, we don't pose any real threat to them in the movies Pro mentioned (indeed, that's part of his argument) if they don't attack us first. And since the reason the aliens want to kill us all is hatred--we aren't simply in the way--they can't use arguments relating to something we have and they don't.5. Granted. But you mentioned your second argument being reinforced.6. So we move. There are already natural cave systems, many of them quite extensive, and I have been to ones that had rails, power generators, et cetera. You talk of walled cities fending off zombies. Well, similar measures can fend off aliens, or more accurately keep them from ever finding survivors in the first place. Similarly, there are actually societies in rainforests. Unless Pro is claiming that Amazonian natives don't exist, and neither do Papua New Guineans, Maori, several tribes of Aboriginal Australians, Pygmies, and the Malagasy. Why do we need large cities? Arguably it is smarter to have a bunch of disconnected places in such an event, whether zombie or alien, because the world would be putting less eggs in a basket, so to speak.7. Conceded.8. I would argue, really, that the existence of zombies is a form of biological warfare, as is their bite. Granted, it is not as easily spread (though one wonders what would happen if it got into groundwater).9. Actually, in War of the Worlds and Independence Day, we did. For the former, explosions were detected on Mars; with our current telescopes we could easily determine that it was artificial in origin, and that it was coming for us. In the latter, we noticed them hovering around and simply didn't figure out (due to the contrived stupidity of a few individuals) that they were about to attack.10. -11. Can you really call something that never ends being brought under control? What you are proposing, as I stated, requires constant vigilence; there is very possibly no cure to the zombie virus. Aliens can be defeated so long as you are sufficently difficult to exterminate. The same does not apply to zombies.12. I suppose that's fair.