A lot of those theories from the image found on Reddit don't make too much sense. For instance, I don't think that Earth is a unique planet at all, and that there are many other planets like Earth, even planets not like Earth where aliens do survive. Also, I don't think Earth is among the first planets; I actually think it's quite arrogant and Earth-centric to assume that.
My theory is this: We have found alien races, and a lot of them too. And we can't trust that the governments of the world, including the U.S., are telling us 100% of the truth, and I don't even think it's anywhere near 100% if you ask me.
Yes Paula, you are absolutely right that Aliens have been interacting with us in plain sight, for centuries...Here is proof of them communicating with their mother ship, and informing their species that Dogs have human masters, but Cats have human Servants, FACT!! ..