The mess Cain left behind back then is really too large, and now trying to clean it up is not an easy task.
But since little Cain is willing to take up the responsibility, at least the situation is improving.
—Although strictly speaking, it really isn't her responsibility.
The current "little Cain", in a certain sense, is Lucia who has acquired part of the Blood Celestial Marshal's memory. Others don't understand, but Aiwass understands well... Isn't this state exactly the same as Aiwass on the day of summoning the Shadow Demon?
Just like how his own memories and emotions remain intact, while he gained partial memories of the "Holy One"; just like adopting those partial memories as part of his self, treating them as his "past life", and being willing to bear the consequences and responsibility for them.
This is why Aiwass repeatedly asks Lucia "exactly how much memory" she has. This is actually confirming Lucia's personal willingness and determination.