PROMETHEUS positivism and epicness.....

Hi this is my first discussion here so im nervious 2 then see all the answer, but here i go.... A few days ago i was reading an article of a interview with RIDLEY, and at some pint i read, that PROMETHEUS is gonna have 2 childrens, one of them is ALIEN and the other one only god knows...THAT IN RIDLEYs words... So i was thinking that the PROMETHEUS posisitivism and the epic felling of the movie is right, because it is supossed that WE WERE SEARCHING FOR OUR BEGININGS, so that something positive, something humanity dreams off, so that a happy thing, that why PROMETHEUS is like that, but the the phrase ends with.... WHAT WE FIND COULD LEAD US TO OUR END., that were ALIENS and the other child is born, when we reach the goal, and we discover that it wasnt what we expected, and it turns to our worst nightmares embodied, theres were ALIEN is born, and only god knows what is the other end we will find.... so i think that were everything turns out to horror an ALIEN starts....