Very few beings really seek knowledge in this world. Mortal or immortal, few really ASK. On the contrary, they try to wring from the unknown the answers they have already shaped in their own minds.
The whole theme of Interview with the Vampire was Louis's quest for meaning in a godless world. He searched to find the oldest existing immortal simply to ask, What is the meaning of what we are?
Stephen King in many respects is a wonderful writer. He has made a contribution. People in the future will be able to pick up Stephen King's books and learn a lot about who we were by reading those books.