Thank you, Mr. Steinberg, for welcoming me to your forum.
In regards to your avatar, the head of the so-called alien "grey," I will now divulge some information as to its origin and purpose, based on what we have been able to determine over the decades.
We try not to think of them as "aliens." An artificial intelligence crafted by servants of the first world, they do not have a will of their own, but rather operate on baser worlds, such as this one, under a basic mandate. Watchers, protectors, call them what you will. A last ditch effort at salvation, their task is to forestall the unknowing self-destructive impulses of a civilization -- until some final event removes their protection and the mandate shifts from maintenance to demolition. Once the watchers show up, life on a planet generally will end within a few centuries at best. Only a handful of times in the history of the cosmos has a civilization survived thereafter.
Death is imminent here. Soon they will turn against us. They will wipe out life on our tiny world, and then it will be replaced with something else. It has happened once already, in the distant past, by way of meteor strike.
The whole point of life on earth, the basis of this grand experiment in a tiny corner of the cosmos, was to produce one great person -- and we executed him. It is commonly accepted that a second great person will emerge, perhaps an impoverished only child of a single mother in a suburban ghetto of New Orleans, perhaps the son of an Eastern European aristocrat, it doesn't matter, because humanity will call her the antichrist and execute her, too. And then it will all be over, our foolishness and ignorant superstitions our final undoing.
The watchers showed up on earth when extraterrestrial sensors detected atomic explosions on the planetary surface. We managed to take several of them down, despite their technological superiority, merely because such violence generally goes unanticipated by the watchers. They arrived expecting that astronomical phenomena had produced the blasts and confusion ensued when they discovered the shocking truth: humans had actually begun irradiating their own planet. The consequences we could not foresee, they would resonate across centuries and wreak havoc even for our children's children's children's children.