I do not believe that the only explanation is demons. That is just as absurd. I do think that is an element to many hauntings if not most. I could see many mainstream ghost hunting shows trying to ignore that aspect.

You will see many Ghost Hunters tell the family to contact them if them certain things occur of if they need other assistance. There are Ghost Hunters that try to debunk but then they have a more religious and psychic team that they do not film if they truly believe they have a dangerous situation.

I think they are interested in determining if the place is haunted and if they can get "proof". Most of the time they will tell the family or owner that it is not a dangerous situation but to call them back if they feel threatened.