What does "Becoming Evil" mean? Nickname?

Is "Becoming Evil" referring to the nickname of James Waller?

Context:

Applicability to Holocaust[edit]

Milgram sparked direct critical response in the scientific community by claiming that "a common psychological process is centrally involved in both [his laboratory experiments and Nazi Germany] events." Professor James Waller, Chair of Holocaust and Genocide Studies at Keene State College, formerly Chair of Whitworth College Psychology Department, expressed the opinion that Milgram experiments do not correspond well to the Holocaust events:[17]
1.The subjects of Milgram experiments, wrote James Waller (Becoming Evil), were assured in advance, that no permanent physical damage would result from their actions. However, the Holocaust perpetrators were fully aware of their hands-on killing and maiming of the victims.
2.The laboratory subjects themselves did not know their victims and were not motivated by racism. On the other hand, the Holocaust perpetrators displayed an intense devaluation of the victims through a lifetime of personal development.
3.Those serving punishment at the lab were not sadists, nor hate-mongers, and often exhibited great anguish and conflict in the experiment, unlike the designers and executioners of the Final Solution (see Holocaust trials) who had a clear "goal" on their hands, set beforehand.