I have been looking for a written-down version of this deep-sounding quote from my favorite TV show (Battlestar Galactica) ever since I heard it, and I finally found it, on IMDB. It was uttered in the episode Resurrection Ship: Part 2 in 2006. Here it is:
Lt. Sharon ‘Boomer’ Valerii: [Adama asks Sharon why the Cylons hate humanity so much] I don’t know if ‘hate’ is the right word… it’s like you said at the ceremony… you said something that sounded like it wasn’t the speech you had prepared. You said, ‘Man never asked itself why it should survive.’ Maybe you don’t.
Context: the cylons, these advanced AI machines initially created by man, wiped out humanity without any apparent reason.