Causality ripples in a way that helps the Future Diary users.
Twelfth's vigilantism let's him catch Third.
Sixth's parents aren't killed and her cult doesn't go evil. Fifth's parents don't join.
Eleventh sees the end of the game in his prototype diary and tells Deus.
God Gasai confronts her younger self. But the younger Gasai is still innocent, and hopes that her mother will recover from her depression. She has not yet given in to despair.
God Gasai hesitates just long enough for young Gasai's parents to arrive and protect her.