Tyr, I understand the point you're making.
I'm going to describe this in terms of Germany, as it is the best known example, but I think you're saying a similar thing about N.I.
The Germans had a bad time as a consequence of WW1 and the economic situation they were put in afterwards. Part of this was that there was a disruption in their culture and history. Their needs to form an identity were not being met. As part of filling this identity need, they invented a whole load of stuff about their pagan past and their Aryan routes. No distinction was made between the stuff that was invented for their identity and the reality of the past. They took this and went from being a disadvantged nation to being a nation that oppressed others, and this invented identity was one part of the reason why they did this.
At the same time, there were other reasons why the Holocaust happened - there was also a misuse and misunderstanding of science, particularly evolution, and a misuse of technology, and many other reasons.
But just because people have misused technology, and the theory of evolution, and the development of identity through taking on disparate elements of the past, that doesn't mean those activities will always inevitably lead to hatred and victimisation of others. They are still valuable as ideas.
And it is possible to form both a personal and a group identity that recognises that your situation in life includes both contemporary experiences of injustice and that has been built upon injustices experienced by people who were members of your group in the past. It is also possible that people build such an identity, and use it to overcome the injustice their group faces without it leading to the victimisation of another group. I don't think feminism is going to lead the victimisation of men as a group, so I don't have an issue with women discussing their victimisation and where it might have come from.
I do sometimes have an issue with that when it comes to pagans, because there are clear issues with racism in Europe (Odinists especially have to deal with this among their numbers) and treatment of native peoples in North America. But the vast majority of pagans are not building an identity for that reason; they are doing so because mainstream culture isn't meeting their needs. As long as they are aware of the potential implications, which many are, then there shouldn't be an issue.