Nitsche did not join the Nazi Party until May 1933.[2] He was a strong supporter of eugenics and euthanasia[2] and was present at the gassing demonstration at what would become the Brandenburg euthanasia center in either December 1939 or January 1940.[3] He was driven not so much by Nazi racial ideology as by his own support of racial science and his vision of "progressive medicine". Being well established, Nitsche was no longer motivated by the prospect of career advancement but was rather ideologically committed when he later joined Action T4.