"I'm trying to understand how do we tell lies to ourselves to justify what we've done and what are the consequences of those lies? But actually maybe I also recognize that in turning empathy into a practice for many years, by turning, by forcing myself to separate at some level the humanity of a human being from his or her actions and recognizing that sometimes, even the moral aspects of a human being can contribute to immoral behavior."

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You start doing the addictive behavior to feel good and then your receptors get overloaded with dopamine, then you stop doing the addictive thing and some of the receptors have shut down and you don't have enough dopamine to feel good. So then you feel bad and go back to the addictive behavior to get more dopamine. The strange thing is that it works with what we think of as uppers and downers and whatever you call gambling - sidewaysers.

— Bill Nye