I think the word "most" is relevant. You can find people with doctorates in technical fields who believe in a Flat Earth or that the Earth was created in 4004 BC. They just aren't most of them.
By contrast, the questions that this book explores haven't received nearly as much expert attention. And if you poll the experts on whether those questions should receive more attention, they mostly say yes!
>69% of [ML researcher] respondents believe society should prioritize AI safety research “more” or “much more” than it is currently prioritized, up from 49% in 2016.
https://www.lesswrong.com/posts/H6hMugfY3tDQGfqYL/what-do-ml...