Why do we fear other intelligences anyway? Isn't that just a sign of our own immaturity? Maybe we need to evolve more before we start think about creating AGI...
E.g. what if more intelligent aliens truly believed that the only purpose in the world is proving more mathematical theorems? And decided to turn all of the planet into a giant math-proving machine? Destroying all the planet, all the animals, all the humans, all the art, whatever, all to prove more maths?
I love maths, but I'd consider that a pretty bad outcome. And there's no reason that I've ever seen to think that more intelligence implies anything about goals.