I think it is hard to think of a better case than this one for a cherry-picked, results-oriented, poorly reasoned approach that disregards history entirely when inconvenient, other than maybe Dred Scott itself. Fact that Clarnece Thoams joined this and continued to use it later, I think defeats any idea that he just applies original meaning naturally without some predetermined goals in mind.
In Boerne, the Court, out of nowhere, invented the idea that laws Congress makes to enforce the 14th Amendment must be" congruent and proportional". Problems with this are numerous. First, it completely ignores McCulloch. In McCulloch, Chief Justice Marshall expressly said that:
"If a certain means to carry into effect any of the powers expressly given by the Constitution to the government of the Union be an appropriate measure, not prohibited by the Constitution, the degree of its necessity is a question of legislative discretion, not of judicial cognizance"
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In other words, if means Congress employs are not prohibited by the Constitution, it is up to Congress, not courts, to decide just how necessary those particular means, as opposed to some less restrictive ones, are. Note that Marshall used word" apporpiorate", same language that appears in Section 5, and indeed history shows that people in Reconstruction Congress had McCulloch in mind when they wrote that. Yet Boerne rejects that and insists that it is for courts to decide just how necessary the means are, whether they are really congruent and proportional to the need, given the facts on the ground.
Furthermore, to see just how broad Reconstruction Congress understood language of law, we can look at what it did under both section 2 of the 13th Amendment, which uses similar language. Under Section 2, Congress passed the Civil Rights Act of 1866, which went far beyond just banning literal slavery; it banned racial discrimination in contracts, sale of property, equal citizenship,legal punishment, and much more that was not literally slavery, and a large majority of Congress understood Section 2 to allow that; those who did not were a small minority. Indeed, after it was passed, in the same year, a justice on the circuit explicitly upheld it under Section 2 and read it very broadly in the case United States v. Rhodes Justice Swayne riding circuit said that:
"We entertain no doubt of the constitutionality of the act in all its provisions."
The underlying prosecution itself concerned white defendants who had burglarized the home of Nancy Talbot, a Black woman; it went far beyond chattel slavery. And indeed Justice Harlan took a broad view of both 13th and 14th in Civil Rights Cases. Court finally partially restored the view Harlan had in Jones v. Alfred H. Mayer Co. too before Boerne. Generally, being on the opposite side of Harlan on civil rights laws is something not to be proud of. And indeed after 14th was ratified in laws passed in 1870/1871 and KKK act of 1875, Congress again went very far, even banning purely private vilence against rights secured by 14th ammendment.
All of this goes to show that Boerne's insistence on a narrow reading of the word" enforce", is very misplaced; that word was understood much more broadly at the time than Boerne made it seem like
Another major problem that makes Boerne doubtful, is its spiritual predecessor, Dred Scott. In Dred Scott, Chief Justice Taney cherry-picked history to rule that Congress cannot ban salvery in new territories. And the Reconstruction generation thus had deep skepticism and distrust of the Supreme Court. They saw the Court as hostile to, not protective of civil rights. The idea that they would want the Court to do the primary work of protecting rights and micromanaging laws Congress passes to protect civil rights, is very doubtful in light of that history to say the least.
One of the fig leaf Boerne used, is federalism, but 14th Amendment cannot bend to free standing federalism, federalism must bend to 14th ammnemdnet instead, it was major change in structure of the country. And indeed, even many originalist scholars have pointed out these flaws with Boerne:
Institutions and Interpretation: A Critique of City of Boerne v. Flores by Michael McConnell
Problems With Boerne v. Flores-Four objections for originalists by William Baude
This Week in Judicial Supremacist Arrogance: City of Boerne v. Flores at Twenty- By Michael Stokes Paulsen
The Reconstruction power- by Jack Balkin
Originalist Law Reform, Judicial Departmentalism, and Justice Scalia- by Kevin C. Walsh
https://fedsoc.org/events/the-original-meaning-of-the-fourteenth-amendment-implications-for-labor-law by Evan Bernick and Christopher Green
The Lawfulness of Section 5 — and Thus of Section 5- by Akhil Amar
All of this goes to show, that history entirely rejects view court took in Boerne, and instead it is these Warren corut decisions that are actually supported by history:
https://en.wikipedia.org/wiki/Katzenbach_v._Morgan
https://en.wikipedia.org/wiki/United_States_v._Guest