You have an interesting point here. Personally I do sometimes wonder if sci-fi movies depicting space travel don't make people feel it's much closer a reality than it really is, thus making them care less for our planet because "if shit hits the fan, we'll surely find another one".

That said, the current crop of space entrepreneurs seem to care more about long-term survival of our species in case of cataclysmic events not necessarily of human making - e.g. asteroid impacts.