Most people have no comprehension of how evil men can be, who go beyond immoral and even beyond amoral, to finding the greatest pleasure in causing horror, torment and suffering to others to unlimited degrees. While people can read those words and say they understand, they can not really grasp the reality of it - and all think they are immune from it. Or how many there are of such attitudes. If people did know, they would all be armed and many likely afraid to go outside.
They can not be reformed. Imprisonment them makes the predators in prison. Often on the forum I have stated that I believe in the death penalty, but not necessarily for murder. A murder can be a momentary crazy thing, a panic or drug thing in a robbery or under extreme stress. Rather, the death penalty should be for sadistic violence for the sake of causing horror, suffering and pain at extreme levels.
Those are mad dogs and should be put down like all rabid animals should. There is no justice it putting them in prison where they are fed, houses, entertained and assured all things of life with no labor in return for which then they are terrify other inmates, and steal the labor via taxes for which many families are paying taxes essential singularly to house that person.
From that video alone, that young man should be taken to the gallows and hung - in public - and then he will harm no one else again and the young woman will never wake in a nightmare thinking somehow he got out of prison and is coming after her again. Kill him and no one need fear him again, nor could he harm anyone again.