It’s common knowledge how children often feel invincible. Add hormones to that and you have a recipe for disaster. These kinds of things happen when you elevate childish young men to the status of gods.
Children had raging hormones and got drunk 100 years ago, 50 years ago, and 25 years ago. Young athletes were always elevated beyond all reason. But I don’t recall this kind of cold, proud, conscienceless gang raping, including bragging and videos.
That is a new thing. And very evil, portending much worse.