Very few good Germans helped the Jews in Nazi Germany. It was a police state that violently suppressed any dissent. There was a very real fear that if you were caught helping to hide a Jew, you could be killed. Nor does there seem to have been much desire to do anything to help the Jews. Two books written in the 1990s show how deeply ingrained anti-Semitism was in Germany when the Nazis were in power.
"Ordinary Men : Reserve Police Battalion 101 and the Final Solution in Poland" by Christopher Browning was published in 1992. The second book with basically the same thesis was "Hitler's Willing Executioners: Ordinary Germans and the Holocaust" by Daniel Goldhagen. It was a 1996 rebuttal to Browning's book. They both agree Germany was very anti-semitic from 1933 to 1945, but differ on how far back and deeply ingrained these anti-Jewish feelings were. In 1998, Christopher Browning counter-attacked Goldhagen in the after-word of the second edition of his book "Ordinary Men".
Both books are controversial since they both go against a long standing trend, from the 1950s through the 1970s that the Holocaust was strictly a Nazi Party thing and kept out of sight from the ordinary Germans. While Goldhagen did win some awards in Germany since 1996, a whole cottage industry has arisen trying to debunk his revisionist idea.