I get the addiction part but what part of the brain shuts off morals? Is it something that you are taught or something you are born with? I have/had a really good friend he was genuinely a good person but as he got older he got more and more rotten. It started small and eventually lead to bigger more serious stuff. I agree with you about the no punishment part but I have seen people who do get punished keep making the same mistakes over and over. It's just a lack of empathy. I don't understand why that differs from person to person.