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As with any group of entities, all have an agenda. Over the eons,
      literally thousands of alien types have visited Earth, having one agenda
      or another. Some agendas are conquest, though these are in the minority. A
      great many agendas are curiosity, and these are never seen as harmful.
      Some agendas are beneficent, but these must never interfere with the
      free-will of the resident, natural intelligent life forms. Where you and
      the hominoids residing on the 12th Planet are both operating in the 3rd
      Density, they mastered space travel enough to shuttle from the 12th Planet
      to Earth during the periodic visits. They cannot shuttle to Earth at this
      time, as it has been deemed by the Council of Worlds to constitute
      interference with your free will because their interaction with humans
      sprang from their agenda for conquest. In times past, other rules were in
      place and interaction did occur. The quarantine was put into place some
      thousands of years ago, but close enough in your recent past that contact
      with this alien life form remains in your legends.
      
      They have no plans, despite fear mongering among those claiming to be in
      contact with these folks, to return to Earth, which they consider a swamp.
      The Earth in their memory is full of carnivores, rebelling slaves, and
      accidents related to wild weather. Now that mankind has technology, a fact
      that cannot be denied due to probes sent about and requiring their mining
      operation on Mars to shoot them down when they come too close, they are
      even less inclined to visit. They were on top before, but do not
      anticipate winning a war on Earth today due to numbers. In addition, what
      would the gain be? Do you live in a swamp when you can live in a palace on
      the hilltop? This was not a vacation resort for them, but going into the
      field on a mission, not the chosen one either. The inhabitants are
      interested, during this passage, in collecting the gold mined since the
      past passage, and in watching the light show. However, one of the legacies
      left on Earth by the hominid visitors from the 12th Planet is
      radioactivity from their nuclear warfare. Yes, they had the bomb, and used
      it. In attempts to nuke each other into compliance, they dropped numerous
      bombs, the majority on the Arabian Peninsula, with a small number in India
      and a scattering across the African Continent. These bombs were in the
      main not as large as the ones built during the Cold War, but were more
      deadly as the radioactivity lingered and poisoned the ground, making it
      utterly uninhabitable, for millennia.