It's not embarrassing that they're Nazis.

It's probably embarrassing because they were brought over at the behest of powerful people who would rather it not be know than they patronized Nazis for political or monetary gain.

Werner von Braun was difficult enough, but you could make the case that they needed to keep him and scientists like him out of Soviet control. This is was probably just people that the Laurentian elite played wet towel tag with at Upper Canada College.