Maybe that is what the Cremation of Care ritual is?
They burn someone alive and effectively traumatize their own brains from witnessing it, creating a cold perception.
Maybe it's why they have kids kill animals at first and work their way up to killing people?
Some kind of ritualistic practice of building on top of trauma to desensitize the brain to violence or even block certain parts of the brain to be more effective in carrying out the rituals?
Obviously, rape would be included with torture and murder in this sense.