[No_More_Harkin]

Hmm.. yes that seems to be the historians universal belief. Since I don't have proof to the contrary I would tend to believe that is most likely the case. Saying "No" German personnel is far too cut a dry for the simple fact no one person knows every case. I did find this:
However, officers such as Hornig were imprisoned, beaten, stripped of rank and prestige and threatened with death for their impertinence. Hornig, a staunch Catholic, actually ended up in a Jewish concentration camp with those he did not kill.

[jalisco555]

I’m not familiar with the Hornig story. Did he simply say no or do something to actively impede the killing?