But even if we develop powerful AI, why are we so scared about it? Why do we think that a powerful AI will be stupid enough to stay interested in Earthly matters or humans when it has an entire universe to go to?
EDIT: From time to time I hear someone established and reputed cautioning against a powerful AI. I am just curious what I do not understand
Example (an year old post): https://www.washingtonpost.com/news/the-switch/wp/2015/01/28/bill-gates-on-dangers-of-artificial-intelligence-dont-understand-why-some-people-are-not-concerned/