Convicted criminal and former CIA Director David Petraeus should know a lot of about the threats to the U.S., as his leadership in the IC did little to stop such threats.  But the greatest threat to the U.S. is not "narrow-mindedness," as convicted criminal Mr. Petraeus states, but is the lack of accountability and responsibility, particularly of those employed to represent the U.S. in our shared government, and in especially in the IC.  Accountability and responsibility have become obscene words to too many in our government, but they are foundational in the successful functioning of any government in a representative democracy.  Certainly all those who failed to stop North Korea from becoming the threat it is to the U.S. today should be held accountable for their failures to protect the America's national security.