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There seems to be an assumption here that intelligence is a positive attribute when it comes to evolution/colonisation. History shows otherwise.
This planet is dominated by bacteria, not humans. Humans fight each other, and the technology to travel to other worlds is very similar to that which would send us all back to the stone age. Even if an alien species did gain the necessary technology, competitive evolution may prevent them from ever actually using it.
We aren't very hardy either. Even with a climate as benign as earth's, we still only occupy about 10% of it, and that's not likely to increase.
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