I've been known to argue that government isn't needed to build roads, protect patent rights, keep Dr Evil from building a nano-virus, etc... But I just thought of a scenario where government could be helpful! (It might also be an argument for Veganism, though not a very good one.)
Imagine we discover Planet Moo, as the poll says, and the animals on that planet can be turned into products just like animals on Earth. At least some people will be interested in going there and taking advantage. But what if those dumb Planet Moo cows aren't as dumb as we think, or some other species we haven't discovered yet would avenge them? The consequences of initiating aggression against an extra-terrestrial species would affect all human beings, because someone who'd want to avenge them won't differentiate between humans who ate Moo burgers or didn't!
Discusss.