This is a good example of the fallibility of taking a simplistic look at history. Nazis were of varying degrees of ideological orthodoxy. Some were fervent and would enthusiastically carry out horrible policies. Some were passive and would just go along with the party for convenience. Grouping them all together loses a lot of detail and nuance. Rabe didn’t seem to have much of an issue with the anti-Semitic properties of Nazi ideology but he did have a problem with the open brutality of the Japanese against China. That’s a complicated set of ideas from a modern perspective but tends to get flattened to “Nazis bad!” by modern readers.