These things, whatever they are, kidnap people, shove things up your ass, and do experiments on without your permission. Who would think those things are nice, and here to help us? Any advanced being has already solved his supply problems 100,000 years ago. If they have water they have a machine they can feed dirt into, it breaks is down to quirks and quarks and reassembles them as water. So they're not here for our water, uranium, food, anything like that. They're here for us, because we have something genetic they don't have. Or some power they don't have, but want. They want something we have, that they don't.