This was a topic of conversation in my Nazi Germany course that I took last semester. The average German citizen during the years of World War II most likely would have held some sort of hatred or resentment towards the Jewish people. This hatred did not suddenly occur overnight as prejudices existed in Germany before the rise of Nazism and Hitler and Goebbels continued to push anti-semitic beliefs onto the German people in the years before the war. Anti-semitism became normalized under the Nazi regime and while we can say it is awful that the German people participated in it but at the time those who did not go with the status quo were generally ostracized from the community. If you are interested more in this subject I suggest you read "Germans into Nazis" by Peter Frische, which discusses how the rise of Nazism occurred and why it appealed to the German masses. I also suggest Ian Kershaw's "The End," which explains why many Germans supported Hitler and the party until his death and even afterward. Lastly, I suggest Christopher Browning's masterpiece "Ordinary Men: Reserve Police Battalion 101 and the Final Solution in Poland." This last book seeks to answer how ordinary men forced into war could commit the atrocities of the Holocaust. This book pertains more to your question as many of these soldiers were just ordinary German citizens and Browning chronicles how these men changed over time while serving in the Reserve Police Batallion. I recommend you read all three books if you are interested in Nazi Germany, however, if you are just seeking more information about this topic read the Browning book as it will provide you with a much better answer then I ever could.