Trivia: Mr. Tuttle is also the name of the housekeeper from another haunted-house movie, "The Changeling" (1960).
Trivia: The disease the children have is a real-life, but rare, disease called xeroderma pigmentosum.
Trivia: Eric Sykes, who played Mr. Tuttle is almost completely deaf and blind, and was 78 at the time the film was made. Although his part was not very demanding, it was played so well, you would never guess that he could neither see nor hear.
Answer: Evil and good do not come into it at all. They are simply dead people. As Mrs. Mills says it, sometimes the world of the living gets mixed up with the world of the dead. They simply died in that house and can't leave just like Grace and her children.
Garlonuss ★