I think our fear for AI comes from the fact that for humanity the excess of power and intelligence is synonym of domination. Yet in our short history we only made use of our excess of power and intelligence to dominate other species and create layers even in our own! We are fed with Hollywood movies with smart aliens that are there only to destroy us or a Matrix to control us to generate electricity. We just don’t have the capacity to project ourself in a different world where the assumptions are completely opposite because our needs are still very close from the ones we had 10000 years ago. My guess is that a real AI with infinite capacity compared to ours can only be beneficial and is a great hope to help us build a better world.