As it happened, the only people willing to pay von Braun to build rockets were Nazis, so (shrug) Nazis it was. If the Americans had recruited him in the 1930s, he would have become a loyal American and a credit to his adopted country, just as he ended up doing after the war. If Stalin had been willing to sponsor him, well, he'd have raised the red banner and become a loyal Communist.
There was never any point in prosecuting von Braun as a Nazi, or even thinking of him as one. Treating him as a war criminal, even though he technically was one, would have been a pointless, performative waste of badly-needed talent, like destroying captured V2s instead of studying them.
Elon Musk? He has no such excuse. Musk can be anything, do anything, say anything. He came to America early and made his fortune doing things that a lot of us respected and even envied him for. Then he chose to attach his name to far-right causes, throw Nazi salutes, and do the Kraft durch Freude dance at Trump rallies. Turned out Musk didn't care about building rockets or going to Mars quite so much as he cared about being an immature asshole. In that sense he took a path diametrically opposite that of Wernher von Braun.
So, yeah, if I worked for SpaceX, I wouldn't exactly bust my ass to make the leader's vision happen after losing trust in the integrity of said leader. I'd simply leave and find employment elsewhere, leaving behind people with fewer options.
Turns out skillset usually trumps justice, as long as you're willing to make the right post-hoc mea culpas.