I could look for some, but it was more of a general analysis. Liberal theology really took over in Germany in the early 1900s. Liberal theology essentially changes long-held belief to be more suitable to the time at hand. These changes usually lead to people caring less about Church and the morality of their religion. Hitler was able to get large numbers of Germans to do terrible things. This suggests their morals were not seen as being sacred enough to keep. I think this absence of a moral backbone comes partially from liberal theology.
"Cheap grace is preaching forgiveness without requiring repentance, baptism without church discipline, Communion without confession. … Cheap grace is grace without discipleship, grace without the cross, grace without Jesus Christ, living and incarnate." - Dietrich Bonhoeffer