Since you do "completely support the president's desire to exclude terrorists" --- what rational person wouldn't? --- any rational person would have to conclude that some "refugees" are terrorists.  Yes, Trump "needs to take a hard look at exactly what the exclusion of refugees from certain parts of the world in combination with the reduction of the number of refugees to be admitted to the United States more generally is designed to accomplish."  As Obama did previously, Trump has concluded that Muslim refugees from certain Muslim countries known to be particularly good at producing terrorists should be subjected to extreme scrutiny.  Given what's at stake, Trump's decision is supremely rational.  

37 years ago, the movie "Airplane" spoofed a man dressed in Arab garb as a terrorist.  It's not so funny now, but it was funny then, because all humor depends on there being some truth to it.  Now the truth of Muslim extremism overwhelms the absurdity---and the humor---of the scene.