I'm not entirely sure where the downvotes came from since other than you nobody bothered to respond, but maybe it's based on people's belief that Nazis are some special and unique threat or that the only thing that should be thought about when they are mentioned is concentration camps and their treatment of the Jewish people, but they did so much more than just that, even if that was uniquely horrifying for the period. The Jews weren't the only people sent to concentration camps, and overall, WWII cost 70-85 million people their lives. Nazi Germany affected so many people, nobody gets to claim them as uniquely their own boogie men to the exclusion of all others.
https://www.history.com/articles/history-behind-the-crown-qu...
But that's all during the war, and with one individual of the royals, and I would think the rest of the royals would not be happy going forward with the Nazis thinking they could mess with the line of succession/assassinate they King.