A new report by Congress says more than 250 Americans have attempted to join ISIS, and one in four of them is from Minnesota, many of them former refugees. [Emphasis added]
Letting more in sounds like stupid stuff.
UPDATE (November 29, 2015): The Taipei Times ran an opinion piece falsely equating opposition to Western settlement of Syrian refugees with the wartime internment of Japanese-Americans.
What the writer of the piece fails to understand is that during war, one does not invite foreign nationals from hostile countries to settle in one's territory because of the obvious security threat. What is less obvious is that Japanese-Americans -- not foreign nationals, but American citizens -- required internment. (Particularly since German-Americans and Italian-Americans were not subject to the same requirement.)
I contend that citizens of Western nations have a right to have a say in their countrys' immigration policies, and are well within their rights to reject immigration of refugees who are anti-Semitic, anti-Christian and anti-atheist.
Finally, it should also be noted that Taiwan has not offered to settle Syrian refugees in its territory, and that some of Taiwan's politicians resist immigration from Communist China on similar grounds (namely, due to national security concerns as well as the pro-unification attitudes presumably held by such immigrants).