"Any hypothetical which places a group of extraterrestrials capable of interstellar travel on Earth is fundamentally a catastrophe." This is not totally correc

"Any hypothetical which places a group of extraterrestrials capable of interstellar travel on Earth is fundamentally a catastrophe." This is not totally correct, if you assume they have to survive countless conflicts (in which such advanced technology, it means aggressive ones would destroy themselves), you may end up with extraordinarily peaceful species.