I think for a lot of real conservatives that’s page one stuff, not page 310.
The book is chronological, dating back to the 19th century. The book starts w/ a story from 1895, then moves back a bit more in time. The Genocides of WWII are not central to the thesis. A book about something else is not necessarily a book about the Jewish Holocaust. So, no, a conservative does not have to insist that every WWII book is about that one topic.