There's actually a long story behind this, and Von Braun was actually arrested because Hitler suspected he was a traitor. Von Braun was a visionary who just loved rockets and wanted to land on the moon and colonize space. The Nazis were a funding means-to-an-end for his rocketry studies. After the Nazis tried to arrest him and his team, he escaped with some equipment and top scientists to defect to the allies.
So no, it's not at all accurate to speculate that Von Braun was a Nazi or into that whole ideology.
He used his expertise to con the Nazis into paying for his very expensive hobby.
Then he came to the USA, and played the same con on Congress to fund his continued work here. Congress thought they were getting ICBMs to wave at the Russians. Von Braun was getting a moon landing, and who gives a shit about politics.