>>I published an essay about the refugee crisis on Medium:
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>>https://medium.com/@TamarEGranor/my-mother-survived-but-millions-died-today-s-refugees-deserve-better-62249e4fcfcd
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>>Tamar
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>And a second question - are you very confident that both the U.S. and Europe have aggressive and effective plans in place to vet out ISIS radicals who try to make it into the mix?

Yes, ISIS is the threat-du-jour.
You forgot to mention communists, Castro Cubans, Nazis, Bolsheviks, Anarchastics, Iranians, Palestinians, members of the Black Hand, Pakistani's, Al Quaeda, the republic guards, some members of the IRA, most Asians, and lots of other people who have been at one time or another threats-du-jour.

There will always be "the enemy" to keep out. We just keep changing the terminology.

In fact, with exception of 9/11, deaths from foreign terrorists pale as a threat to the US populace when compared with gun-related murders, mass shootings and domestic terrorists like Timothy McVeigh.