The point reasonable, intellectually honest, intelligent, people are making is that a 'muslim travel ban' isnt not going to prevent terror attacks on U.S. soil anymore that it would in Europe since the murderers did not get on a plane a month before and fly into Europe, they are European nationals whether born or naturalised.  But dont let that little fact stop the spread of misinformation, fear, and hate mongering, its worked so well for 45, why shouldnt his followers/ admirers continue.