If that's correct, why would he implement it with almost zero consultation with the State Department, the CIA, Homeland Security, Military Intelligence, and others?  There are tens of thousands of people in the American administration with expertise that could have positively influenced this Executive Order, making it more effective, more targeted, less discriminatory, reduced its negative effects on innocents, reduced the likelihood and effectiveness with which this would be used as an ISIS recruiting point, less likely to alienate allies.  If the goal was as you suggest, why not ask some of those people for input?