If you're justifying your program by spending its resources trying to goad people with mental handicaps and other lowest common denominator people into committing terrorism, what have you accomplished?
Any organization with a degree of security, one a nation would consider an adversary, is aware of the dangers agents pose with infiltration.
http://www.democracynow.org/2015/3/19/how_the_fbi_created_a_...
http://www.npr.org/sections/thetwo-way/2013/12/08/249610501/...