I can imagine us being alone quite easily, but I like the "dark forest" idea better. The universe might be full of life, but the basic rules are same, that is, resource is limited, and own survival takes priority, so if you are an advanced civilization, it is much better and safer for you to wipe out the competition before they do the same to you, and if you don't know the capabilities of the other civilization yet, you'd try to stay hidden till you are sure you are not the weakest. So maybe all intelligent civilizations are hiding from each other, and maybe those who tried to make themselves known got wiped out?
Quote:To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.
- Lau Tzu
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