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In case Aliens exist: Should we say hello?
No. Alien life would seek to harm or completely destroy humanity.
Everyone would finally be forced to work together to fight a common enemy.
There's actually a huge lack of humanity and morality, an alien invasion would hopefully invoke self reflection. If won, we'd likely be an entirely different society from there on out.
Hello might be interpreted as a sign of aggression.
There is no evidence for this.
Aliens would know humans exist even without us saying hello.