Why as Few 'Children' as Possible

The Alien themselves fully Know : -[1st]- That it is inevitable for the destruction of their own existence to become brought upon them by God upon 'Judgment Day'.
[2nd]- that God**Will** finalize this destruction when in His Given 'Salvation' He does attain enough numbers of 'Children' from Wayward Planets that ibecome 'Sons of God''.

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Thus the Aliens believe that they can put off their own inevitable destruction through keeping as few 'Children of Man' as possible from becoming 'Sons of God''.