In a world without law and order, you can still be a sociopath, which is very dangerous in that you would lack a sense of moral responsibility.
murderer is a funny subject, I'm a pacifist at heart and am even against the death penalty, and trophy hunting. If it's not in self defense I just don't agree with killing someone. After looking up the term murderer, yeah Shane was certainly that, despite the fact that he 'saved' Lori and Carl. The death of Otis can be perceived as nothing more than a revenge killing.
Shane being a rapist is not debatable. A person says no, that's the end of it. All that transpired before is irrelevant
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