The issues of extreme right and extreme left revolves around the fear of the loss of self – disintegrating – becoming unhinged. It originates with some deep seated fear – primordial but yet reachable and explainable. The basis for this energy is the lack of understanding in regards to the underdeveloped state-of-being ‘s inability to process this unrecognized emotional energy as information.
This unresolved emotional energy is triggered by surrounding event(s) which then allows this unacknowledged emotional energy to overwhelm the cognitive ability to understand the origins of the emotion, leading to the resulting behavior in attempts to reach resolution.
The extreme right and extreme left are unable to moderate their emotional energy – projecting their unacknowledged fear onto others. They don’t trust themselves due to this unresolved and unrecognized emotional energy that then overwhelms their state of consciousness (being).
Spiritual Side Through Judith L. Harper, 09/11/2011

