Permitted

But prisoners could not be permitted to kill themselves; suicide violated the logic of the healing-killing paradox. Indeed, overt suicide; such as running into the electric fence, was considered a serious violation of discipline and often exhaustively investigated. (Suicides by Treblinka prisoners were described by one commentator as the "first affirmation of freedom" contributing to significant prisoner rebellion in that camp.  More gradual submission to death as in the case of the Muselmänner, could be tolerated or even encouraged because it did not seem to challenge Nazi life-death control. The healing-killing paradox, if it was to be internalized by the Auschwitz self, required exclusive' control of life and death on the part of Nazi perpetrators.
--Robert Jay Lifton, "The Nazi Doctors: Medical Killing And The Psychology Of Genocide", p. 150