Storminess and Historical Fallacies in Nonfiction and Fiction

Due to yesterday's ice storm, today's snowstorm, and tonight's howling winds, we will certainly be losing power, and I always feel I want to post something before the internet is blown away. The ice accumulated on trees and wires yesterday and last night, and after the snow accumulation today and the winds, branches and trees are falling.

I'm still listening to Dutch Girl as I knit, and I continue to come across inaccuracies that make me think I'm going crazy. The author, who is reportedly known for his investigative journalism of historic subjects in the 20th century, wrote that Anne Frank and her family, after spending time at at a camp in the Netherlands, were eventually sent to Auschwitz.

This is true.
BUT Margot, Anne's older sister, and Anne resided in Auschwitz (Poland) for only two months. Their mother remained in Auschwitz after her daughters' departure, as did their father (though husband and wife were not together). Margot and Anne were  transported to Bergen-Belsen, a concentration camp in Germany. Margot and Anne spent many more months at Bergen-Belsen than  they ever spent in Auschwitz. In discussing Margot's and Anne's deaths, the author never mentions Bergen-Belsen. This omission leads the reader to conclude that Margot and Anne died at Auschwitz, which is absolutely false. The Frank girls lived and died under the conditions at Bergen-Belsen, which have been extremely well documented.
On top of that, we have the fact that the author stated that Unity was the youngest Mitford sister. This is also false.
Well, naturally, I fault the author, but you know, in truth, I fault the publisher more.
All works of history and biography have customarily been fact-checked, or they used to be. But today, it seems that many publishers have relaxed these standards.

I've been finding a few glaring errors in works of historical fiction lately as well.
Last month I started reading The Huntress by Kate Quinn. Perhaps you know her most well-known novel The Alice Network. I set the latter aside after fifty pages because I didn't feel the presence of authentic historical detail.
Somehow or other, perhaps idiotically, when I was desperate for captivating reading material while I was recently laid up, I downloaded The Huntress, largely because it had  starred reviews from Booklist and Library Journal.
I cannot tell you how disturbed I was when Quinn's protagonist equates the German Iron Cross with the Nazi swastika. This conflation occurred several times within ten pages. I was horrified and couldn't believe my eyes! These two iconic emblems of 20th century German history to be confused!One assumes that when an author specializes in a historical time period, they have studied the period thoroughly for a period of time and, in addition, are extremely well read within that historical era. In Kate Quinn's case, I must say that this is patently untrue. This error felt like fingernails scraping on a chalkboard for me, and into the trash heap The Huntress goes! Do the historical novelists of 2020 believe they don't need to be specialists of European history in the 20th century if they write fiction about it? I ask you.