The correct answer to this open question is the following.
The rhetoric of the article helps to develop the purpose of it in that the author uses Pathos as the emotional approach to convince its audience.
In the article "Nazi Germany Euthanasia Program," from "Commonlit," the author explains that the Nazi Party used the term euthanasia as a way to clandestine kill disabled people. The author describes how the Nazis did it and that this was one of the first programs of mass murder in Germany. It started in August 1939, and two months later, the Nazis invited the parents of disabled children to take them to pediatric clinics were doctors killed the children.