From reading science fiction to libertarianism - and to reading history

Not long ago, Rob Fisher asked, back at his blog, before he started writing here, whether there is a correlation between an early enthusiasm for science fiction and later being a libertarian, and if so what might be the cause of such a correlation. And I seem to recall the notion finding its way here also, although I can't recall or find where. It may have been in a comment thread. My take is that SF embodies the idea that things could be very different. Maybe a more general version of the same idea is that SF leads to political radicalism of all kinds. There was certainly a huge enthusiasm for SF on the left before World War 2. Think only of H. G. Wells.

I recently mentioned to Michael Jennings that I too went through a big SF phase in my teens and twenties, while in the process of becoming a libertarian, and that although I subsequently stopped reading much SF, I did later become very keen on reading history. I still am. The connection between reading SF and reading history, at any rate in my mind, is that just as SF says that the world can be very different, history is all about the fact that, in the past, the world actually was very different. Things change, from era to era, from epoch to epoch. History and SF both say that very loudly. Libertarianism, and all the other isms, say that also.

As far as history is concerned, I'm thinking of things like how the sea, in the European Middle Ages, far from being any sort of defensive wall (as Shakespeare's John of Gaunt famously describes it - and as it later became) was actually more like a motorway system, for those able to command the vehicles to make use it of. I'm thinking of how very different life was if most of the people in the place you lived in were illiterate, perhaps including you. I'm thinking of how very hard it was even to preserve the great ideas of the past, let alone accumulate new ones with any success, before the printing press was contrived. I'm thinking of what a difference swords and bows-and-arrows and gunpowder and machine guns successively made, and what a difference atom bombs and hydrogen bombs have made to our own time. I'm thinking of what a different world it was when it was very hard to send messages of any complexity (or for that matter human beings) any faster than a succession of very expensive horses could gallop.

Michael's response was that reading lots of SF, then becoming something like a libertarian, then reading lots of history, is a fairly common intellectual biography. So rather than ramble on, let me ask commenters. Does that sequence of interests ring any bells with any of you good people?