Human on human abuse. gratuitous infliction of pain, rape, both in combination, summary killing, torture to death, and a range of psychology-based confections, are all predictable behaviors of the Ape Without Scruple, who is released when social constraints are suppressed, or absent.
Zimbardo’s Stanford Prison Experiment, The Lucifer Effect ISBN 978-1-84-413577-6, elucidates the first stages of release, and historical records describe the rest of the slide to the diabolical.
Anyone trying to address rape in war, as currently, should familiarize themselves with Zimbardo’s work. They must be able to admit man’s underlying propensity for the vile, if they are to make any headway in that endeavor.
They will need a level of competence I have yet to meet.