First, their is a difference between refugees (the topic of this article and the group specifically mentioned by the op) and undocumented immigrants. 

Second, your assertions about undocumented immigrants are alternative facts. In the real world of peer reviewed studies and actual statistics,  immigrants commit less crime than native born citizens https://www.cato.org/blog/immigration-crime-what-research-says They are a net positive to taxpayers http://www.epi.org/publication/immigration-facts/#_note15 and do not take yer jobs http://www.epi.org/publication/immigration-facts/

Third, your odds of being killed in a terrorist act by a refugee are 1 in 46 million. Your 29 times more likely to be killed by a regional asteroid strike, 260 times more likely than being killed by a lightning strike, and 407 thousand times more likely to be killed in an auto accident.http://www.businessinsider.com/death-risk-statistics-terrorism-disease-accidents-2017-1