To only believe this guy had "mental issues" as the reason for his allegiance to the Islamic State shows ignorance and a lack of understanding how rapidly this ideology is spreading throughout the world.  IS has established a following on every continent (Antarctica the only exception).  There's IS terrorists involvement in the US, SA, Europe, Africa, Middle East, Asia (Philippines, Indonesia) and recently discovered a strong IS sympathizers in Australia.  Their ability to recruit world wide on social media and other methods is amazing being that they appeal to a new generation that really have no loyalty to the country of their birth or national origin; basically the younger crowd who are searching for a purpose and are not satisfied with the politics, religion and direction of their country.  They're an ideology that is driven to destroy the Judeo-Christian faith and to impose their will to destroy us because they know we are tolerant and don't like to fight back.   WAKE UP AMERICA!!