It's a strange phenomenon -- the feeling of helplessness many Messies have about housekeeping.
The Messie sees a sock on the floor and thinks, "What a shame! A sock on the floor. It really ought not to be there." She sighs and continues on, momentarily saddened about the sock.
Why doesn't the Messie pick it up? I think it is because her mind is tired when it comes to housekeeping. Years of trying and failing have destroyed any sense of success, so she avoids the situation instead of doing something about it. And, besides, the mess is so out of hand everywhere else, what difference does one sock make? It is much like lifting a motorbike. It may be hard but it can be done by trying. But if you have to lift a truck, you may feel that it is really not worth the effort to try.
That's why it is important to have a plan. The big job of "housekeeping" would be impossible if it weren't done one job at a time. This is the principle behind the Mt. Vernon Method (or Mt. Vesuvius Method) and the Flipper System. They break housekeeping down into small attainable goals. They alleviate the mental overload that caused the impotence to begin with.