It's probably just a tribal thing. Libertarians know they'll do better as a group if there are places to run. Unmanned space travel doesn't help from this perspective.
Eh. Libertarians can be dreamers too. There's a vein of transhumanism and immortality-seeking in certain parts of the movement (which I don't particularly respect, but that's another matter).
But say you're a Libertarian and have some ideas about how society ought to be structured. Meanwhile, society is clearly structured a certain way which (according to your worldview) is not consistent with that (e.g. the US government, undue tax burdens on the private sector, and bureaucracies like NASA) and it's not particularly likely that you're going to see massive restructuring of it in the near future.
Why would that stop you from taking issue with specific irrational policies of those bureaucracies? If space travel (or carbon-reduction or whatever-you-want) is clearly a goal of society, then you might as well try to cope with reality and at least try to make sure they go after that goal as effectively as possible, and limit the damage it's going to do.
But say you're a Libertarian and have some ideas about how society ought to be structured. Meanwhile, society is clearly structured a certain way which (according to your worldview) is not consistent with that (e.g. the US government, undue tax burdens on the private sector, and bureaucracies like NASA) and it's not particularly likely that you're going to see massive restructuring of it in the near future.
Why would that stop you from taking issue with specific irrational policies of those bureaucracies? If space travel (or carbon-reduction or whatever-you-want) is clearly a goal of society, then you might as well try to cope with reality and at least try to make sure they go after that goal as effectively as possible, and limit the damage it's going to do.