Chin is not loved?  Would love to see your source for that?  Perhaps Fox news?

Your basic statement is just wrong.  No one is saying that more mass murderers should be let in.  People should realize that imigrants only become terrorists after years of living here.  So the question should be on why and how do people get converted into extremists.  Ignore this and it won't matter how many bans you have.  They just won't work.