Frum is generally pretty good, but this piece is pretty bad, even though I agree (in general) with what he's saying.
He, as many, starts with a
false premise. There is no crisis. Illegal immigration is at a 46 year low.
Also, this part is plainly false:
"...increasingly unanimous opposition among Democrats to any form of immigration enforcement at all."
Note how he can't even name one elected Democrat official that has this policy.
It's similar to the egregious strawmanning of any criticism of how this is being done as somehow advocating for "open borders". It's dishonest nonsense.
The argument he's purposefully misunderstanding is that no prosecution service has limitless resources, so directing such a huge amount toward relentlessly prosecuting people (and tearing their families apart quite possibly leading to irreperable harm) for misdemeanors similar to jaywalking and graffiti is idiotic and counter-productive, especially given the harm they do in the process.
What he's also ignoring is how there have been countless attempts by Democrats to compromise to pass immigration reform. Obama tried, multiple times, since the start of his presidency. All the proposals they supported had all the ramped up border security stuff Repubs claim to want, but it was never enough.
Schumer and Pelosi even offered to give Trump his idiotic wall and other border security increases for DACA protection earlier this year. He flatly rejected it, after his usual schizo back and forth.
In fact, there's bipartisan legislation available now that has majority support in both houses of Congress. It can't get a vote because GOP leaders are beholden to the racist wing of the party that refuse to do anything.
Their immigration system (in general) is fairly broken, and the only ones to blame are the GOP.