While I agree with you that completely eliminating curse words from some stories does make it feel silly, Dragon Age: Origins and the word "sodding" as an example, I don't think that Destiny is that type of game. If it was that the Last City was under constant bombardment and people were dying everywhere then I would agree that it should be more "mature" for lack of a better way of phrasing it. But that isn't this game. Even from what little we've seen int he vidoc Destiny is just an adventure, and one filled with hope. If you want to take a game and make it more serious and darker then yes add all the curse words and "grit" you like. But that will not be this game.