If they revealed themselves fully all religions and governments and corporations on earth would collapse either immediately or within a few years.
So, this is strategic that it is done this way.
They don't want to ruin the quaintness of Earth because many visitors to earth like this level of quaintness.
Besides Earth is a Galactic Protectorate meaning the planet is maintained by the Galaxy and it has been this way for millions and millions of years already.
In fact, most off world civilizations tend to see humans about the same way we see deer (both bucks and does and fawns) so we are considered wild and primitive by Galactic Standards and after our ancestors nuked Maldek (now the Asteroid belt) out past Mars and also destroyed Mars for our ancestors living there too we are not trusted to own our own timelines and so all our timelines are maintained directly by the Galactic Government (even though many Earth Governments also help in preventing nukes from going off retroactively since World War II.
This is why so many of you remember being blown up because you were before time was returned to the way things are now in various nukings of countries, Cities and the whole earth itself into an asteroid belt.
So, many of you still remember dying and all sorts of stuff before your lives returned to normal.
So, you can see why things are the way they are here on earth.
