Answer:
The fall of the house is caused by the crack in the structure of the house. In my point of view, Roderick Usher did have some responsibility of her sister (Madeline) death and fall of house. Roderick Usher had heard the voices of his sister (Madeline) when she was trying to escape from the tomb. Usher speaks “Not……door!” Usher had opportunity and time to go check on the tomb and say something about the noises. But he did not. In this way I considered him responsible for the death of her sister and the collapse of his home.