As the sibling comment points out, we really just don't know what else is out there and how common or rare the earth situation is. I think the way one reacts t

As the sibling comment points out, we really just don't know what else is out there and how common or rare the earth situation is. I think the way one reacts to something like this is an interesting Rorschach test, though. I had the same gut reaction you do: this probably means that life-bearing planets are even rarer than I already thought. But I think that because it confirms my personal bias - that we don't see evidence of other life in the galaxy because it isn't there. Other replies to your comment call this hubris and remind you that you're extrapolating - which is true. But in my experience with people who jump that direction, it's because their bias (and/or hope) is that we can't be alone and that we just haven't found other life yet. I just think that's interesting.