Werner Von Braun was an actual nazi. He was also a great scientist. The world is just complicated sometimes.

The idea that all his science funding was an elaborate ruse to insulate himself from prosecution is just not a very well grounded view. His chosen method of insulation was terribly inefficient with respect to time and money. He would have gotten a much better ROI by investing in politicians directly, the fact that he chose to focus more on science than politics makes it pretty clear that he had a genuine interest/passion for it.

I don't see why he can't like science for its own sake and be a child abuser. The two things are not mutually exclusive.