Neutral case is when the civilization of humans and aliens too different from each other. Both will not feel there is nothing to link together. Unexpected circumstances happen is that aliens can attack and wiped out humanity by a more advanced civilization and not friendly. Aliens may also like humans are growing very fast and need to avoid the risk of extinction. Then maybe it will destroy mankind to protect their civilization. The aliens are "green" will likely oppose the destruction of the human environment and the clean sweep of humanity to protect the planet.
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