This is going to be spoiler heavy so it’s best if you avoid reading further if you haven’t watched the movie yet.
One of the most talked about (and debated) parts of Ridley Scott’s Prometheus is the scene in which David accompanied Weyland to the Engineer’s sleep pod, and rouses the “God” from his slumber. Being able to converse in all known languages, David manages to converse with the alien before things went south.
The scene isn’t subtitled, so people were expecting to never know exactly what David said to earn the ire of the Engineer. One of the points of contention is whether David delivered the message exactly as it was asked of him or sabotaged the message.
According to the film’s official translator and linguistics consultant, Dr. Anil Biltoo, David did exactly as he was asked, and delivered the following message: “This man is here because he does not want to die. He believes you can give him more life.”
So we guess David really wasn’t doing anything evil. The Engineer was really just a grumpy little god who didn’t want his sleep to be interrupted by the same species that he was charged with destroying.