My answer to the submitted question:
Humans introduced AI for the same reason they introduced a straight pen over a quill and a calculator, or inadequate tedium and the Internet over the card catalog. It is called progress. Would you believe there were those who rejected the computer and the Internet for exactly the same reasons the question rejects AI? It all boils down to: I do not understand it and I am afraid to try it. Get over the fear or get left behind.