One of science fiction's greatest tricks is playing ''vast, cool intelligence'' and peering through a Martian telescope aimed Earthwards and noticing just how weird and irrational we all are. At its best, science fiction is a literature that can use the safe distance of an alien world or a distant future as a buffer-zone in which all mores can be called into question - think, for example, of Theodore Sturgeon's story of the planet of enthusiastic incest-practitioners, ''If All Men Were Brothers, Would You Let One Marry Your Sister?'' published in Dangerous Visions in 1967.Cory Doctorow: A Cosmopolitan Literature for the Cosmopolitan Web
Behind every torturer's mask, behind every terrible crusade, behind every book-burning and war-drum is someone who has forgotten (or never learned) that all laws are local. Forgetting that all laws are local is the ultimate in hubris, and it is the province of yokels and bumpkins who assume that just because they do something in a particular way, all right-thinking people always have and always will. For a mild contemporary example, consider the TV executive who blithely asserts that her industry is safe, because no matter what happens in the future, the majority of us will want to come home, flop down on the sofa, and turn on the goggle-box - despite the fact that TV has existed for less than a century, a flashing eyeblink in the long history of hominids, most of whom have gotten by just fine without anesthetizing themselves with a sitcom at the end of a long day.
Which is not to say that cosmopolitans don't believe in anything. To be cosmopolitan is to know that all laws are local, and to use that intellectual liberty to decide for yourself what moral code you'll subscribe to. It is the freedom to invent your own ethics from the ground up, knowing that the larger social code you're rejecting is no more or less right than your own - at least from the point of view of a Martian peering through a notional telescope at us piddling Earthlings.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.