The Marisa makes one wrong choice, and her life descends into despair and decay. She does what she feels she has to to survive, and when she hits rock bottom, she lashes out at that which she believes stole her easiness.
Pretty Catch-22 stuff. I really find it hard to hold myself back from crying for this Marisa. She worked hard for that gold badge, and lost it all because she wanted to refresh with a gutter Reimu.
Well, in order for them to poo-poo, when they're very young, they either have to be taught the poo-poo dance, or their anyarus have to be stimulated by wiping warm water against them.
Then again, if the anon doesn't wipe their anyarus, he risks them getting Mr. Mold or simply dragging the bean paste around the house everywhere.
This guy did baby them too much, however. While pets, they should still be taught how to take care of themselves. It's almost like the anon is setting himself up to make them into spoiled little brats.