Pondering a space opera setting that addresses why we aren’t already a satrapy for aliens:
The galactic standard proof of being a civilized species is sending out self-replicating killbots that wipe out any civilization that attempts to colonize another solar system. If a colony ship leaves your solar system first, you’re toast. If your killbots do, you’re welcomed to galactic civilization.
Various big space opera plots:
• A stellar stream cut off from the galaxy for aeons reconnects, and it contains a multi-system civilization. An expansionist empire is one kind of problem; a peaceful civilization that has different rules is another one.
• A rebel group is rescuing populations from a world whose dominant faction is expansionist and hiding them and copied biomes in a Type II system.
• An intelligent civilization on a water world will never get to space. Contact them anyway?
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