Let us suppose that an intelligence was looking for a ready made space object on which to make a home, either temporarily or a longer term basis for exploratory purposes, ( Humans on Moon, or Mars for example? = altho with the current state of this planet, I am not sure of using the word ' intelligence' is appropriate!)
Using an asteroid for long term high speed travel around the universe could be a viable option for a suitably advanced micro civilisation. Along comes NASA, wipes out an established base. What better excuse for the home base to decide they have had enough of 'earth' - one press of a button and our current problems are over, we are history?
OK, wanderings of a over active imagination, but do we really believe we are alone?
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