But why would an advanced civilization need slaves?
With our present technology we barely need workers today. With in a few decades nearly every unpleasant task that a alien race would want to do on our planet (mining I would guess) could be done cheaper and more efficiently by robotic mining equipment.
Unless enslaving other races is their hobby I cant see a purpose in conquering the earths people.
I they wish to inhabit Earth it would make more sense to be to exterminate the human race.
To me the most realistic Sci Fi movie on this vein was Independence Day.
When the President ask the captured alien what they (the aliens) want from the Earths people the alien replies We want you to die.
If the aliens arrive on Earth and they do not announce themselves as I see it they have only two possible motives;
The first is benign and that is to do anthropological studies.
The second is malignant and that is to study us to discover the most efficient method of eliminating us.
For an advanced civilization the second would not take long and eliminating us would not take much longer. For the first it could almost all be done form outside of the atmosphere by listening to our electronic emissions.
As referenced above . . .
IF the so called ET’s or the real ET’s in cahoots with satan and his fallen angel cohorts are what’s really going on—as I’m convinced it is . . .
Then
the issue is to deceive mankind and detract as many; turn as many; and with the global government in place, destroy as many as possible before Christ returns to reign in complete control of all creation and this planet.
Scripture says that as in the days of Noah, so will it be in the days before the return of Christ Jesus.
One of those features of such days was that the fallen angels; the “WATCHER” would be busy copulating with humans—creating hybrids and polluting human genes in violation of God’s law to them.
They are eager to throw sand in God’s face to take what little vengence they can from being kicked out of Heaven with satan . . . by being destructive to God’s favorite creation.
That quite well explains more data points than any other explanation.
The DVD’s from the ANCIENTofDAYS.net site ref’d above are very good with a wealth of referenced material outlining the above with a lot of evidence from many disciplines.