This does not work at all in most instances. I'm a descendant of Poles who suffered greatly from Soviet oppression and later due to communist rule in Poland. I'm always open to share their horrific stories because it's important to know the past.
The two most frequent arguments I'm getting from those young people fascinated with communism is:
1. The history books are false, Gulags were education communities where people chilled and exchanged ideas
2. USSR was not real communism and we'll make it work this time.