I know - but I would have used the horrors of the concentration camps as an example of how bad the NAZIs were - and not the goofy characters as shown in the show.
Now that I recall - my kids did know about the camps quite a few years before their classmates. One of them wanted the Diary of Anne Frank, and then the others read it. She got in arguments with other kids that didn’t believe her when she discussed it at school. I’m guessing about fourth grade. So probably a similar age as I was while watching Hogan’s Heroes!
I'm just grateful I was a child in the days a child could be a child.