Everything that the culture deems bad is now an addiction. It is based upon the premise that all human beings are intrinsically good and would act good if they were free from the affects of society and addiction. There is no such thing as a bad person, only victims of their disease and societal abuse. These people are just misunderstood. Tell that to the parents whose 17 year old girl was raped and murdered by a repeat child molester. Tell them that this murderer is really a good person.
In this case the basis is medical. Long term exposure to the endorphen release of orgasms causes changes in the brain much like those from cocain.