The Yautja are hunters, and roam space and time looking for ways to create arenas where they can breed and then fight the Xenomorphs to prove themselves to be worthy of their domination. Yes, Xenomorphs, the perfect organism, evolved over their host from black goo contamination, are the most destructive force in nature designed to kill life as we know it. Pure malice and pure jealousy for anything living, a bio weapon in possession of the engineers. So, the Yautja found a backwater planet and landed here thousands of years ago to make human sacrifices so the hunt could begin. Yautja keep sending their blood hunters to Earth for centuries when it gets hot, to either start the fight between Xenomorphs or as seen more recently in modern human civilisation, prey on humans and started finding them worthy of being trophies. Of course as the company consolidated all the technology and ideology of centuries of human civilisation some fugitive Yautja started helping humans to fight aliens, fearing an invasion. But it did not happen and after 125 years of company domination on Earth humanity went into space reached the stars and exoplanets, mining resources and developing more advanced weapons, enough to handle any aliens. I arrived here in one of their space research stations, where Xenomorphs were being integrated with human dna giving rise to super soldiers.