I understand your point of view on this, and I think this is why there is a general rule against exploring someone's home. There are too many issues about privacy and human decency to consider.
I am conflicted, though, because there is also a certain amount of real human drama which plays into the decision to document a place like this. I hope I do not offend you in any way, but I like to think that there is a difference between your experience with your father's house and Fred's house. For all intents and purposes, Fred's house seems to have been livable. Despite the rooms filled with junk and dust, there appears to have been a place he was sleeping, food in the fridge, etc. The decay of perishable items could easily have taken place in the time after his death and before the photos were taken. In the case of your father (without knowing anything of the situation) it sounds as though there was a long-term problem of unsanitary conditions existing there. The two stories, I think, are markedly different.
All that said, I can understand your view, and why you disapprove of this type of thing being available for all to see. It is, after all, a private matter how all of us choose to live our lives. Perhaps only in a cautionary sense is it permissable to put this type of thing on display.
To INA's credit, though, I think he documented this site in an effort to share the enormity of his discovery, rather than in a crass attempt to impress others or gain from Fred's death. As I'm sure we've all experienced at one time or another, it often helps to share with another human something which is fantastic or enormous, especially in its emotional impact. For some reason, it helps one process one's own feelings to see someone else who is experiencing similar things. (For more on this, see
Catharsis.) I don't see this location as an attempt to do anything but share the outward mystery which surrounded this man's life. Whether that was an appropriate decision or not is up for grabs, but I suspect his motives were noble.
Hmmm. This is a toughie. Anyone else care to chime in?
-- Mat