Let me take the minority view on this one. So… what if we do actually destroy the earth by building a machine of this power? Perhaps every intelligent species has had the technology to build such a thing without the corresponding ability to accurately model what it will do when they turn it on. Maybe we’re about there’s a cosmic corner that you just can’t peek around without taking a leap of ill-founded faith. There could be a point that all civilizations reach where they self-destruct because the laws of physics are bent too far by inexperienced hands, turning curious societies into a tragic stream of dead worlds. Maybe that’s why we’re “alone;” it’s because everyone else committed technocide.
I can’t wait for them to turn it on! I’ll throw a party!