The southern border of the US is terribly overrun with crime, much of it coming from immigrants. This is not to say that all or even most immigrants are criminals, but much of the crime in that region is caused by immigrants.
However, from my reading of the article in the OP, to even note this fact apparently diminishes the human dignity of the immigrants. Beyond that, we are meant to accept any crime or danger from immigrants as a necessary danger inherent in doing good. The article makes clear that ISIS has posed as refugees, and used this status to carry out a suicide attack. But again, this danger is one that cannot be combated, lest we make the larger error of thinking that immigrants, even dangerous ones, can be turned aside.
If the author of the article has children, I invite him to drive to the most crime-ridden area near him and to pass out keys to his house, and offer to let anyone who desires it to stay in beds in the same rooms as his children. Doing this would have the possibility of doing great good for the lives of many homeless and poor. There's a definite danger to his children, but hey, that's a risk he'll just have to take.
Look, we can reform immigration to both respect the dignity of the immigrant while also maintaining security of our nation. To do this we need to make sure that immigrants are properly screened, but that they are not held in inhumane or unsafe conditions while this happens, and that if they are not allowed entry to the country that they are transported safely back to their homes. If they have no homes, this may mean the creation of human refugee camps for them to occupy until conditions change and they can once again return home.
But we won't get such reform if people treat any concern about security or any restriction of immigration as a crime against human dignity. If you really believe that, open up the borders completely. Get rid of the idea of citizenship and give all benefits of the nation to anyone who enters the borders of the nation (with no checks or restrictions on who passes through those borders, of course).