This book is very good for anybody wishing to understand basic economic theory and see many examples throughout history of this exact debate taking place over and over and over again: https://www.amazon.com/gp/product/0517548232/ (see the chapter "The Curse of Machinery").
For the past 3000 years of "modern humans", we have had a monopoly on the human brain and creative intelligence. That monopoly is coming to an end. What will the average worker do when a robot that can out-wit them? You cannot just handwave this problem away saying "it always creates new jobs!!11".
This problem is well-summarized by this video: