What an illogical and sad analogy. What a deceptive self-trumpian justification.
If my brother or sister were homeless, I would take him/her in, help him get on his feet and expect him/her to "get with it".  If s/she were criminal/ill/on drugs  I would first alert the proper authorities and professionals who can deal with their issue(s).  As a nation, refugees are our brothers and sisters who are not only homeless but under threat for their lives.  Screen, yes; wall-out like lepers - disgraceful, shameful, sad.