Occasionally, when watching something like Nigel Latta's Into The Darklands, or reading an Alan Duff book, it is possible to feel some sympathy for a killer. Taffy Hotene, for instance, suffered severe abuse and alienation from his family, from very young and for many years.
I have yet to experience the faintest twinge for this character. In fact the effect is inverse to the amount of past 'hardship' he parades.
This is essentially the prequel to Terminator
3 minutes ago