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I’m pretty sure aliens already visited earth looking for intelligent life abd didn’t find any.
This. This is my favourite take on the whole conundrum.
Capitalism. It leads us to selfdestruct. Therefore, only civilizations that managed to overcome that obstacle managed to reach spaceflight, and they are watching us right now in shock and horror as we dance towards the planetary obliteration fully aware of what we do but unable to stop because few thousands people’s profits are more important than entire species.
Well, it’s as good answer as at least few other Fermi Paradox answers.