User blog comment:Mohrpheus/Spiritual Imbalance in Bleach - The End of the World?!/@comment-1932702-20100901104153

@Mohrpheus- There are a lot things that are vague in the whole life-death cycle, especially in Eastern Asia, which is probably the most diverse continent (in terms of culture and beliefs) on the planet. Kubo is no saint but I think when Rukia was explaining thee Hollow business, Kubo needed to give his readers a reason why Hollows must be killed. There have been a lot of humans since the dawn on the Homo sapiens' age but we don't know if, in Bleach, new souls are produced1, or if (nothing actually meant here, just a thought) there's something like a "soul-recycler" or something like that.

1I'm thinking like any country's mint: it keeps producing new notes but old ones are continually used with some destroyed.

This is what I think: the objective is to keep the number of live souls more or less a constant. I'm guessing there was a Shinigami who lived eons ago who realized this paradox (someone like Yama-ji's great grandfather...etc). He could have propagated the idea of maintaining a balance. Shinigami age slowly and aren't killed easily. Hollows are produced by the dozen and destroyed by the odd million. Somewhere in all of this, there is a balance, and at this point in time, I'm looking for it, cuz I can't darn find it ANYwhere!!

There's my opinion in one heck of a big nutshell.