I suppose it all comes down to attitudes and time frames really. Attitude, whatever the time frame is about 10% what happens around you and 90% what you decide to do about it.
The nun saw something she didn't like and decided to make issue of it, conveniencing herself by ignoring the blood soaked history of her own organization who's tyranical, ironfisted reign over medieval Europe lasted a good deal longer and took many more lives than Hitler did in less than a decade in the mid 20th century.
Her attitude is obviously that of the hypocrite, no better than a Holocaust denier when it comes to the darker chapters of her own group's history.
Go far enough back in history and you realize NOBODY is innocent, we've all done things we'd rather forget, such is humanity.
Machines are machines, its what the human mind does with them thats the problem sometimes. Machines have no mind, no will and no malice. All such things are human vices. The political correctness folks seem to have trouble coming to grips with this fact that we aren't a perfect beast as species go, only an idiot would claim we were perfect.
To those who build models of the "enemy's" hardware (whoever the "enemy" was at the time) keep on doing it, its history preserved.
For the political correctos out there, dust off a copy of George Orwell's "1984" You could also rent the film addaptation that starred Wiliam Hurt, it follows the book well and you get the visuals if reading isn't your thing (or if you burned your copy of it already). Either way, what happens in that story is exactly what you get when political correctness, censorship and revisionist history get free reign. How would you like life so censored that the dictionary has been pared down to six words that you can legally make conversations with and you get nasty punishments for speaking outside those six words? Yep, it happened in that book.
If it were me, I'd remind that nun of her own group's darker history and tell her to go play "Big Brother" with someone else!