Another thought.
Maybe highly advanced civilizations aren't as aggressive and warlike as we think. If that was the case, they'd never be able to get over their own internal struggles. A species that has a natural tendency to expand to the point it exhausts resources and needs to keep on expanding might not be able to develop to the point where they can create interstellar technologies.
Perhaps advanced aliens, via process of selection, are benevolent and see the inherent positives of allowing other intelligent species to develop: Diversity of thought, experience, technology, biology, etc...
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