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disillusioned
Kraken
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Great Filter - Wikipedia
"The concept originates in Robin Hanson's argument that the failure to find any extraterrestrial civilizations in the observable universe implies the possibility something is wrong with one or more of the arguments from various scientific disciplines that the appearance of advanced intelligent life is probable; this observation is conceptualized in terms of a "Great Filter" which acts to reduce the great number of sites where intelligent life might arise to the tiny number of intelligent species with advanced civilizations actually observed (currently just one: human)."
Intelligent races evolve on planets and become successful but after a while they fall victim to low birth rates thanks to their social decadence while lower IQ peoples breed more rapidly or even mix with the more intelligent ones effectively destroying that civilization over time while leading to a massive de-evolution of the species in question. This is why we have never been visited by any alien species. All species destroy themselves via massive dysgenics before they can make it to that point.
Just look at what is happening in the world right now. The low IQ nations are breeding massively while the more intelligent ones are either dying or de-evolving. Even the Chinese have low birth rates. Things aren't looking very good.