I don't know how long I have to keep spoon feeding you guys the answers.
http://www.starchildproject.com/
Watch the starchild skull video, and click on the 2010 DNA link on the left side there in blue as well.
In but 10 or 15 mins you will understand that:-
1. We are a Genetic engineering experiment by the ET's.
2. They took a 24 chromosomal paired Orangutan - and gene spliced the 2nd and 3rd chromosomal pairs to create a 23 chromosomal paired genetic engineered "hybrid" capable of hybridizing with the 23 chromosomal paired ET's.
3. There was a very good genetic reason for this.
Its really a Darwins theory of evolution reason for "cleaning up contaminated DNA".
Darwins theory (law) is that only the fittest survive.
This means that non beneficial genetic mutation is eliminated, it doesn't survive.
Going back to the Orangutans, - they have only 4 known genetic mutations and all are beneficial, one is occasional twinning, another is albinisim (while not strictly beneficial it isn't a dis benefit to survival et).
So in billions of years of evolution on earth, the Orangs DNA displays only 4 known mutations - i.e. it is very pure.
So what about us Humans if WE re descended from the apes and have only been here 200,000 years?
How many known mutations that are non benefic in the human DNA genome so far?
Ahh - we've been round less time than the Oragutans, so we should be less than 4 - right?
Yet we have thus far over 4000 known genetic mutations!.
Why or how is a better question?
The answer is clear - we were genetically engineered from badly mutated genes and only relatively recently.
How do genes get mutated?
Well Nuclear radiation will do it, as will excessive solar infrared exposure - our planets atmosphere is a great shield against radiation generally. Another causation is compassion - advanced civilizations like ours has recently become in the 20th century - will allow genetically mutated beings to exist and even reproduce - so we now have nursing homes that allow non beneficial genetic mutations to live and procreate - with for example downs syndrome affected children allowed to be reared and to reproduce, same with dwarfism and so on. We are now headed off to screw up our own DNA out of compassion
Can you imagine how contaminated the DNA of an advanced ET civilization might have become - at least 4000 such genetic mutations that we know of - yet billions of years for good ol Orangutans on earth only allows 4 known mutations (and all benefic or at least not dis benific is in albinism).
If you genetically engineer a 23 chromosomal pair being, and allow it to spend eons on earth, Darwin's theory (law) of evolution "survival of the fittest" - will 'clean up' that contaminated DNA in only a few short billions of years - eliminating the non beneficial mutations that cause so much hereditary genetic disease and death, in developed and advanced civilizations (much less immortal ones).
If you want to grow new organs etc for transplants of diseased ones - clean DNA hosts of stem cells etc would grow genetically perfect non hereditary disease infected spare organs, in great supply.
Earth and it's humans are a medical experiment by an alien entity in short.
I am quite certain that their world and it's laws probably bans some types of medical research just as we do - and also probably euthanasia - or maybe they are already immortal even.
So I would wager they have a badly contaminated DNA by now, making growth of healthy replacement organs etc quite difficult from their own highly contaminated DNA and hereditary disease very widespread within their civilizations - maybe too high to allow normal asexual reproduction even.
The mere fact we still have 4000 known genetic mutations within our human DNA genome is ample proof that we didn't evolve from the apes at all - we are genetically engineered hybrids - created by gene splicing a local hominid and genetically engineering a hybrid from that - i.e. bred for a specific purpose - to clean up another aliens DNA for medical reasons and far removed from their societies & legalities of medical intervention most likely - a factory growing new and clean DNA host material - away from the prying eyes of their advanced society.
In short they are breeding us up so they can get back to the joys of sex & orgasm once again.
Who knows what end use we 6 billion genetically engineered robots are intended to be put to eventually?
The thing is - it could be to fight interstellar wars as their programmable robots (why we are easily able to be hypnotized), it could be as donor DNA repair material for their own populations, we just don't know for sure - but the thing is from OUR point of view - the future doesn't look rosy - because their experiment has come to an end - we now have nuclear power - the ability to totally screw up and mutilate our own DNA thru nuclear accidents like Chernobyle and below ground French Nuke testing like Muroah atoll etc etc
It's no wonder the ET's are coming back to harvest / recover what they can of the clean DNA, before we do as they have done, and totally screw it up again with our advancing technology.
Really speaking they need to remove the DNA as it is now and place it elsewhere in heaven on a new earth in the heavens - and give it another 200 000 years of uninterrupted survival of the fittest to continue cleaning the DNA up.
Isn't it amazing that our biblical texts all foreshadow a war in the heavens & immortality for the true believers, living in a new city prepared by the Gods in the heavens a new heaven and a new earth etc etc
Yes - a war to get rid of the evil doers (genetic deviants), and a new world for the genetic cleanup to continue.
At the end of the day to the ETs we are but as mold growing in a petri dish - an experiment - inside an incubator and every 100 years or so they come back (open the door to the incubator) take out the Petri dish and take a look at us, their experiment, and either put us back, or start a NEW culture in a new petri dish on a new source of agar.
To these Gods a year to us is but as a day to them - so 1000 years is like checking the experimental petri dish every 3 years to one of our scientists monitoring his petri dish in its incubator.
Non of this is hard to understand - they don't so much wish us harm any more than a scientist wants to kill off the mold he is growing in his experimental petri dish, UNTIL the experiment is over....then all bets are off.
Welcome to our petri dish existence fellow mushrooms & spore!
Cheers
HA! Would y'all contact ANTS? Or, maybe BEES... THEY would coming out of the Hive, fighting... 
LOL; WHAT IF... "they" were our descendants looking for G-G-G-G-Great Grand Pa or Grand Ma, one of whom was "serving time" in prison, and "they" were just doing family history research. Coming from MANY years "in the future", and from ANOTHER dimension; of which I was informed , that there were TEN dimensions in this MULTI-Verse. Mutations occuring 
