But there may be one reason that ETs would visit Earth ….

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….and that reason appears in the 2008 version of The Day the Earth Stood Still (with Keanu Reeves).

And that reason is this: 

The Earth is only one of a few (or maybe the only one) planets extant with the flora and fauna diversity found here.

Thus it is, perhaps, unique and must be preserved at all costs.

Advanced civilizations or species found this planet, in forays across the Galaxy or Cosmos long ago, and determined that Earth is a one-of-kind (or one-of-a-few) planet(s) that showcases the multiplicity of life as evolved or created.

And being advanced, the cosmic travelers have become regular visitors working to document this one-of-a-kind biosphere, maybe even capturing examples of the species found here – humans among them – and transferring many to planets that haven’t developed such diversity but are able to maintain such transferred species.

A 1960 Twilight Zone, with Roddy McDowall, had the same kind of idea: an astronaut that landed on Mars is housed in a caged replica of a human habitat (house) showing that Earth species are something to be viewed as unique.

RR

For Easter