e.)  And from HPB and Master DK:

(
i)  The Atlantis-race became a nation of
wicked magicians. 'In consequence of this,

war was declared, the story of which would be too
long to narrate; its substance may be found in the
disfigured allegories of the race of Cain, the giants,
and that of Noah and his righteous family.
The
conflict came to an end by the submersion of
the Atlantis
, which finds its imitation in the stories
of the Babylonian and Mosaic flood.
The giants and
magicians.' … and all flesh died … and every
man.'
All except Xisuthrus and Noah, …'  


(
ii)  … The use of cataclysm was the method
employed in Atlantean
days, as you well know from
the tales of the flood;
and through the flood there
was almost complete destruction of the
civilisation of that time
.

It is hoped that such a drastic step will not be
needed today, though
there are ancient
prophecies which foretell the possibility of the
destruction of this world at this time through
fire—instead of flood
. Which of the two methods—
divine embodiment and natural cataclysm—will be
employed will really be decided by humanity through
its use or non-use of free will and understanding.
If
humanity fails to unite under the banner of the
Forces of Light against the forces of material
aggression and selfishness, then the "fiery
ordeal" might be unavoidable.”
 ‡‡


f.)  
And according to Georgia Stone, less than
500 million are needed to sustain
humankind on Earth
!
c.)  Meaning if the vast majority of mankind:

(i)  Choose to side with forces of darkness,

(ii)  By denying and rejecting higher
principles and teachings
like: Compassion,
Goodwill, Sharing, Selfless Service, Solemnity,
Fearless Sacrificing For Justice, Total
Continuous Striving, and so forth…


…Spiritual Hierarchy will let forces of
darkness
accomplish their destructive plans.


d.)  As revealed in Agni Yoga:

(i)  It should not be thought that the dark
ones will cease their destructive attacks
.
Decay is their nourishment, murder their profession.
Encroachment upon the spirit and body is their joy.

One should not assume that they will not try to
penetrate behind even the most protected boundaries.
They would rather perish than abandon their
demoralizing work of corruption
.  
(
Supermundane, 26.)

(ii)  Certain insects and reptiles choose to perish,
only to be able to bite and release their poison.
Similarly,
the servitors of darkness are ready
for the most disagreeable consequences, if only
they may create poisonous evil. One must
firmly remember these creators of evil, who
often do not spare even themselves for an evil
deed
. Many instances can be revealed of the carrying
out nevertheless under the suggestions of the dark
ones of a premeditated evil that could not be
advantageous to the evil doer himself. …
 
(Fiery World II, 69.)
 Helena Blavatsky, The Secret Doctrine Vol. II
‡‡  Master DK, thru Alice Bailey, The Externalisation of the Hierarchy