Talk about clutter...
The Collyers' mansion is the nightmare for people with OCD. Absolutely no organization, things piled up to the ceiling, complete chaos. Where is the "use" in these items if they are not placed in their appropriate location, such as a mantel clock placed on, oh I don't know...a mantel! It's this seeming irrationality towards the "use" in the everyday objects that the Collyer brothers collected that may give support for the claim that hoarding is a mental disorder, which is appropriately named Collyer Brothers Syndrome (Herring).
However, it is difficult to have absolute evidence to whether the behavior of hoarding is a mental disability. It just could be an effect of environmental factors or the person's state of mind in the moment. I've personally experienced periods of hoarding in times of stress. When I feel my mind all cluttered, my room ends up being an extension of my mind. It becomes hard for me to organize my things or to throw away items that have no use because I suddenly believe that it may have some future use. In the case of the Collyer brothers, their clutter may have been a result of the environment around them - Harlem. The "social disorder" around them imbued itself into their minds and their house became an extension of the social disorder that they saw on the streets of Harlem.
However, it is difficult to have absolute evidence to whether the behavior of hoarding is a mental disability. It just could be an effect of environmental factors or the person's state of mind in the moment. I've personally experienced periods of hoarding in times of stress. When I feel my mind all cluttered, my room ends up being an extension of my mind. It becomes hard for me to organize my things or to throw away items that have no use because I suddenly believe that it may have some future use. In the case of the Collyer brothers, their clutter may have been a result of the environment around them - Harlem. The "social disorder" around them imbued itself into their minds and their house became an extension of the social disorder that they saw on the streets of Harlem.