Choose with mind or choose with heart ?!

Wernher von Braun
leader figure in the development of rocket technology to the Moon and to mars and all NASA discoveries till now. If the technology it's on the point we see we can thanks him...
Also he was a SS member from Algemeine, pioneer on the V2 rocket program, rocket made to kill in mass innocent civilians and constructed by slave labor that kill like 20.000 slaves just on the V2 production. We was not judged for his crimes on German Nazi just because he was a cientist we could live for the benefit of the American government.
Two extremely different points of the same person.
Now its when I ask you if you could erase him from the history when you want, you would choose erase I'm before or after the NASA development of nowadays knowing that at first he was on V2Program in Germany and after on the NASA development ?