I can't compare the two of them on that basis. One was inured into the society before the Nazi's system barely existed (as acknowledged with hindsight). At what point does a government become 'evil' (for want of a better term, and lacking the time it would take to discuss such complexities)? How do citizens respond to their own appraisal, when that appraisal is subject to many internal and external factors?
Even the Nazi's victims were often unable to see what the government represented, unable to comprehend, and never fled and ultimately died for it. Many joined the party out of fear, or earlier also in search of an alternative? The responsibility of the allies after WW1 and how they created the situation under which the Nazi's came to power?
It's far too complex and none of us experienced it (and even then experience is a small slice of 'reality') and to judge people of their morals is unhelpful and divisive.
This is why I said that someone's actions should be their point of judgement; to, for example, be a member of the party should not be a measure of someone's totality. And to in any way say Barbie's actions were comparable to Von Braun's and hence should not be examined is for me, denial of what happened and why. Maybe coming from German Jewish ancestry may make me a little biased in that area, my paternal Grandfather was one of those who saw clearly where things were going and succeeded in escaping with his family.
Personal morals of the people involved are undefinable, but their actions are still definable, and so judging the former is personal opinion, the latter is nearest we have to establishing facts.
And further on morals, lets not forget Barbie was actually recruited as an intelligence asset by the US (I'm pretty sure it was CIA or related) after fleeing to South America, how do the morals of those people who recruited him balance against those of Barbie himself?
It's all very difficult stuff to examine and rationalise, but to not question these things is a big mistake! How we question them is what matter's, but to skirt difficult issues because they are so contentious and hard to understand is enabling the next crop of such people.