What if people have the message all wrong?

Once a civilization of intelligent beings, regardless of where they came from, knew the secrets of everything, and decided to garden massive self sufficient ecosystems. Earth could be one of many. We might even think they made this universe. Then upon the discovery of mankind, they were especially fascinated due to their similar features and design. One of these aliens, if you will, corrupted our genetics. Not by making us 'evil', but by making us "like God" or, "intelligent like god". This was an abomination, due to the fact that we had an instinctual moral code that would prove to be extremely destructive when coupled with such levels of intelligence. These aliens tried to communicate with us and made hopeless attempts to win our trust. They laid down the fabric of moral code that we should follow if our species was to survive. If we followed this code, we would be saved, and be able to essentially "team up" with these aliens. Upon all the failed attempts, they made plans to destroy the world if our technology and misguidance ever got out of hand. Meanwhile they're watching us. Hence the thousands of flying saucers and such. (which you will think is hogwash but really shouldn't be overlooked.) watching humanity's progress in knowledge with great interest, ready to strike at a moments notice. It just so happens that several military persons have come forth with stories about all the ufo activity they had over nuclear bases, which is sketchy evidence but better than nothing.

Anyways, it's just a random idea. Hopefully it'll make you think.