Just as we're worried about being a single planet civilization that could be wiped by an asteroid, maybe they'd worry about being a single star system civilizat

Just as we're worried about being a single planet civilization that could be wiped by an asteroid, maybe they'd worry about being a single star system civilization that could be wiped out by a single disaster. So far it seems like life is not everywhere, so there should be many uninhabited planets for the taking.