A. Jung was not “involved” with Nazism, opportunistically or otherwise. If you disagree, please provide hard evidence of his involvement. Thus, there was nothing Jung needed to apologize to regarding the Nazis.
B. Jung did not have extramarital affairs with his patients. And his relationships with Sabina Spielrein and Toni Wolff, however they are described, followed the rules that we abide by today [i.e., the current ethics code of the American Psychological Association (APA), 10.08, which addresses the issue of sexual relationships between doctors and their former patients. It is worth noting here that the latest evidence is that Jung did not have sexual relations with Sabina Spielrein].
C. Wikipedia is not a good source on something as enigmatic as Gnosticism – more properly, the diverse traditions of the Gnostics. I have been reading the Gnostic works since the late 1970s when the texts discovered in Nag Hammadi, Egypt, in 1945 were translated and published. The Gnostic imagining of the Pleroma and of the One make it clear that they see a primordial unity underlying the duality on the surface (e.g., see the “Gospel of Truth”).