20-30y ago is a good chunk of time. my parents were 20 when i was born, and i would not want to be judged by my parents decisions either.
You’re talking about a generation after the nazis. they’re ashamed of their nazi parents the same way people today are ashamed of their maga dollarstore-nazi family.
For the record I think the producers of SoM should have been able to use the original footage they wanted to; however i would not be as willing to rewatch it as i am now if every viewing meant i was subjected to that kind of emotional trauma if they had.