A comment from an article by a representative of Doctors against Gun Violence, who are being thanked by Poly group for their support, paints the picture of why the CCFR and others are slamming them. They're working with Poly on the "tell a lie enough times ---it will become the truth" basis.
http://www.cmaj.ca/content/189/21/E7...EBa7WwxLGLIlGI