Into That Darkness

Into That Darkness: An Examination of Conscience by Gitta Sereny, Vintage Books, 1983. 

Austrian Policeman

After the Anschluss of Austria to Nazi Germany,  Franz Stangl an Austrian policeman, went to work for the Nazis.

Cripples

His first assignment was to participate in the involuntary euthanasia of undesirables, those deemed to be unfit to live, such as those who were mentally ill, mentally retarded, or physically crippled.

Sobibor

After the euthanasia of the unfit, Stangl was transferred to become commandant of Sobibor death camp.

Treblinka

Since he did such a good job at Sobibor, he was appointed Commandant of the new Treblinka death camp. Franz Stangl thought that the Nazis killed the Jews for their money. Stangl did not hate Jews, but he had contempt for them, because they went to their deaths without fighting. 

Careerist

Stangl was a careerist. He wanted to get ahead. He was afraid that the Nazis would shoot him if he refused his assignments. Franz Stangl was captured in South America after the war. He was tried for war crimes and imprisoned.