Lots of different theories.
Reminds me of a day we were fishing for marlin off Bermuda's south side, and some of the guys were discussing the reason we humans are here. Slow day for marlin!!
Stinker opined that we were a food source put here to multiply, and one day we would be scooped up and eaten by aliens.
Tommy asked "You mean something is going to eat me whole?"
Stinker said "No, Tommy, when they get to that part, they'll spit it out". LMFAO
Meanwhile, back at the ISS---
