I am not understanding why this series seems to be so controversial and the Nazi show is not.
There are a LOT of people who, rightly or wrongly, consider the south/confederates to have been the good guys, and are no doubt worried that that they will be portrayed negatively. Virtually nobody thinks the Nazis were good, so there’s nobody around to worry about them being portrayed in a negative light.
I did read a few years ago about a documentary on Civil War reenactors, who get in uniform and recreate battles. Some of those interviewed felt they were wrongly portrayed as pro Confederacy.