The guy lost me when I saw these as two of his bullet points.
"The big picture is that refugee plight is a
vehicle for radical Islamic terrorists who
easily infiltrate the
stream of hard-to-vet victims of war.
Immigration, until President Trump's executive order, was arguably the largest security
blind spot for America to date."
The first is an unproven assertion. The second is extremely misleading.
"easily infiltrate" is a gross exaggeration. By every estimate I have read it takes at least 2 years to go through the refugee program. There are dozens of easier and cheaper, if not legal, ways to get into the country. The refugee program is designed for those looking for a permanent change and as such is difficult and time consuming, but just getting into the US temporarily is not difficult.
And immigration as a 'security blind spot' makes it sound like this is a new problem or one we haven't been dealing with for decades. Our immigration security is better than ever and by a wide margin. But as a country with four thousand miles of coast and even more inland boarders, there is no such thing as complete border security. If terrorist have resources (and most do) they can get here if they really want to. We are deluding ourselves thinking we can 'solve' the problem. And we haven't had a shred of evidence that terrorist are coming in from Mexico or using the refugee program.
Trumps executive order doesn't change much of anything except eliminating a long and tedious point of entry.