What causes a person to live in filth?

I helped my parents clean up their rental property after the occupants were evicted. There were TV dinner trays on the floor. Sunflower seeds on the carpet. Cat crap in the closets. This house was trashed and there is no way that my words can successfully convey how filthy this was. It looked as if a small... show more I helped my parents clean up their rental property after the occupants were evicted. There were TV dinner trays on the floor. Sunflower seeds on the carpet. Cat crap in the closets. This house was trashed and there is no way that my words can successfully convey how filthy this was. It looked as if a small tornado came through the window and made the rounds.


Why do people live in filth?
Update: These people weren't old. They were in the late 20's or 30's. I don't like nasty people. I've found I have lesser tolerance for them even more now.
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