A study funded by the U.S. Justice Department found that "lone wolf terrorists," individuals motivated by the ideology of a certain group who act alone, are prone to mental illness, often acting from some combination of personal grievance … a public health one as well — certainly another reason to reframe the discussion surrounding the causes of terrorist acts, and to argue for an increase in the resources available for preventing, identifying, and treating mental illness.

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Are Radicals Mentally Ill? | Dr. Peggy Drexler – Huffington Post