I asked this question to a number of individuals at the 5th anniversary celebration of Occupy Wall St in Zuccotti Park in New York City (09/17/16). Here is a summary of the responses I got:

Selfishness x 3

Fear x 2

Lack of communication x 2

Ourselves

Lack of understanding of ourselves

Orthodox thinking

Our thoughts cover up our souls

We are trapped by our thoughts

We focus too much on problems, we need to catalyze fairness from within

Greed and megalomania

Violence to greed is destroying our planet

Envy, greed, materialism

Ego

Male dominance

Lack of connection among people

Forgetting our unity

Stratification of the human race (Master-, Puppet-, Sub-humans)

There is a moral crisis caused by rapid change

Poverty and starvation

Lack of a fair system to distribute our goods and services

Lack of political consciousness

War profiteering

Banks and military

International banking system

In conversing with each individual, I was able to show how most of the issues raised can be thought of as a direct subset of the larger problem of dichotomous thinking, particularly selfishness, greed, envy and problems related directly to thought or involving division among people. Fear can, at certain times, be beneficial, but is a problem when it leads to inappropriate or counterproductive dichotomous thinking directly interfering with problem-solving.  Dichotomous thinking is the reason for the various forms of division among people. I propose that dichotomous thinking contributes to the more systems oriented problems (last 6 on the list) by enabling gullibility and promoting apathy through distraction.

It has now been 5 years since I began actively blogging on this issue. Despite a lack of success in generating widespread interest in this issue, I have only become more convinced that the framework I am proposing is a useful one and that this is ultimately our most fundamental problem as a species. Nothing has validated this more than the rise of Trrummp whose direct appeal to the reptilian brain has come as a complete shock to many analysts who think primarily with their cortices. I continue to Tweet and several months ago, began working on a book which will attempt to spell this idea out more comprehensively.  As always any thoughts or feedback are greatly appreciated.