Here’s a quote that may help us understand why many of us are driven to excess, especially when fear is involved.
Selfish behaviors are reward driven and innate, wired deeply into the survival mechanisms of the primitive brain, and when consistently reinforced, they will run away to greed, with its associated craving for money, food, or power. On the other hand, the self restraint and the empathy for others that are so important in fostering physical and mental health are learned behaviors – largely functions of the new human cortex and thus culturally dependent. These social behaviors are fragile and learned by imitations much as we learn language.
Dr. Peter Whybrow – "American Mania"