What do you think is the answer to the Fermi Paradox?
The Fermi Paradox is a contradiction between the seemingly high probability of advanced extraterrestrial life existing, given the vastness of the universe and the apparent ease with which life arose on Earth, and the lack of any conclusive evidence of such life. Essentially, it asks: if the conditions for life are common, why haven't we detected them yet?
The Dark Forest Theory is popular right now because of the awesome books.
My thinking, because I'm a cynic, is a sort of absolute filter. I think intelligence is just a bad survival strategy that collapses under the weight of all it's own contradictions and intelligent species always go extinct before they can make any real impact in space.