The rationale given reads that this is because none of the perpetrators are currently alive, but is not history a science about ancient times so that participants most of historical events are not alive now?
I left a comment explaining that since the Nazis who were responsible for making these decisions were not available to answer, that means that the rest of us can only speculate on the reasons they had. This further means that any answers provided will be based on opinion or guesses, and furthermore will encourage discussion or debate. All of these are violations of the guidelines for all Stack Exchange sites. Any question that can only be answered with opinion or speculation will be closed.
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Already this question has generated a considerable amount of discussion and even debate. SE is not a discussion forum; it is intended to be a place where people can find clear and concise answers. This question is not worded in a way that will ensure that can happen.