This guy clearly put an insane amount of thought and work into this. I can't imagine how long it took. As far as theory goes, I like this one best:
DollofAikaVillage - 1 day ago
The girl gets a doll for her birthday. The doll becomes attached to her owner...her "mommy". The doll becomes jealous of her mommy's parents. She murders the mom on a bed...her dad becomes sad. Buries his wife on the beach and commits suicide there. The doll and her mommy are all alone now...the dolls wants to keep it that way. Locks herself and her mommy in a room with bars...they are all alone now. With the doll's new shiny toy...and eyes in all directions watch them forever...I love my mommy..