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tl;dr: Evolutionary biology, evolutionary psychology, game theory, & signaling theory can lead to some credible inferences about alien cognition & motivation... and they suggest there are extreme risks from active 'Messaging to Extraterrestrial Intelligence' (METI).
This paper doesn't offer much to rebut the idea that brief observations of flying pellets don't give you enough info to ascertain the feasibility of an otherwise opaque agent behind them FWIW, my tolerance for people calling each other's ideas "dangerous" is at an all-time low
when everything is dangerous nothing is.
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