That made me cry
That reminds me of this site http://squalorsurvivors.com/index.shtml
On the squalor survivors site it even says you shouldn't clean up someone's stuff behind their back because of results like that. For a hoarder, the crap (even the outright garbage) is some sort of safety net. It's comforting. To have it all be gone suddenly, without warning, can snap someone. Because really, the hoarding is a symptom of problems, not the cause. Even if you do clean it all up and they are happy, it's just going to come back again if the cause isn't addressed (whether that be emotional problems, OCD, whatever).
Though at the same time, I'm not totally knocking her kids. It said the house was going to be taken away from her by the city and they just didn't know what to do so they did what they thought was right.
As for neat hoarders, I think it counts too. It's still hoarding. My mom says my great aunt was a very neat housekeeper but had tons of stuff hoarded away, all neat and oraganized. She once showed my mom that she had a bunch of cans of coffee she bought because they were on sale. What got my mom was that Aunt and her dh didn't drink coffee so how is that saving any money? Maybe it was the need to acquire but it was also the need to have things on hand. I think it's like an alcoholic. Someone can have a good job, isn't driving drunk, isn't laying in the gutter, and still be an alcoholic. If they need to drink and can't stop themselves then they are still an alcoholic even if they aren't as dramatic and obvious as the person vomiting on their bosses shoes.