>And if such life is possible beneath Earth's oceans, why not elsewhere, like Europa?

Because saying life can survive somewhere is different than saying it can evolve somewhere.

I hope they remembered to program in the Laws of Service Robotics:
      1. A robot may not damage a beer or, through inaction, allow a beer to come to harm.
      2. A robot must obey beer orders given to it by human beings, except where such orders would conflict with the First Law.
      3. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.