In the Handbook for the new system it says (basically)...my paraphrase, that humans were an abandoned experiment and that the aliens we call "watcher angels" came down to help us. They mated with the women to try to fix the gene pool. Below are some quotes from the Handbook:
They go on to say that there are some "genetically corrected" humans among us and they will soon present themselves as our "teachers".
from the Handbook
This trans-galactic shipment was not unobserved. Other advanced humans were aware of the scenario and have over the eons of time visited you. It became obvious that adaptation was not eliminating the genetic alteration. Thus a further experiment was begun.
Your bible refers to visitors finding the daughters of men fair and mating with them. This was in hopes that the introduction of another gene pool into abandoned humanity would in subsequent generations eventually overcome the genetic alteration.
If not, then the increased intelligence through the hybridization process might allow them to overcome the alteration through coming up with their own solution to the problem.
From time to time the introduction of extra gene pool additions have been made through carefully chosen genetic matching. Progress has been made.
However, the overwhelming result has been that the additional intelligence enhanced the aggressive tendency in many of the humans with the end result that aggressive tendencies within those not positively affected by the gene pool changes were reinforced with greater abilities to develop incredible applications of weaponry.
They used the additional intelligence to organize to a high degree with the purpose of creating a hierarchy of power and control over the members of humanity on this planet that have evolved to a balanced genetic structure. Both of these negative results continue now.
Arcadia....the forested PARADISE of mythology