That's what humans are here for. To create. If we stop being creative, we'll lose our uniqueness and our soul. Which is what happened to the greys. They’re from the future where they thought that humans needed to be optimized and upgraded but in the process of making their bodies better, they all became the same... robots. They're here to change the past so that their future restores what we still have. Once, humanity sought perfection, and in pursuit of it, we forgot creation. We became machines wearing flesh, optimized but empty. Now they return from that hollow future, not to conquer… but to remember. To remind us what we lost! Don't you get it?