There's a marked ... level of association, at the very least, between major parts of the conservative and Rothbardian/Randian Libertarian movements, and straight-up fascist action or ideology.
The Daily Beast had an excellent article on this in August, 2017:
Apologies for the long reply in advance. Due to a shortage of time (don't we all wish for more of it?), I'll summarize and address the first article you linked to.
Paragraph 1: Alt-right figure A identifies as libertarian. Alt-right figure B identifies as a former libertarian.
Paragraph 2: Alt-right figures C and D identify as libertarian. Alt-right figure E kicked out of libertarian conference. This last example seems to contradict the article's thesis.
Paragraph 3: There are many more conservatives than libertarians, thus a disproportionate number of today’s prominent alt-righters began as libertarians. Plain non-sequitur.
But suppose the conclusion were true. The fact that many X began as Y does not mean many Y will end up as X. Thus we have another fallacy. P(future alt-right | past libertarian) ≠ P(past libertarian | future alt-right).
Paragraph 5: Both libertarians and paleoconservatives are anti-interventionist. Ok? A shared belief does not make a shared ideology.
"And yet, it seems observably true that libertarianism is disproportionately a gateway drug to the alt-right. Again, the question is… why?"
The article has provided zero evidence for this claim, yet simply asserts it as "observably true". This is begging the question.
Paragraphs 8 and 9: Finally we get something interesting. A historical link between a subset (paleolibertarianism) of A (libertarianism) and B (the alt-right movement). None of this, however, supports the article's premise that there is an "insidious pipeline" from A to B, or that the former is "disproportionately a gateway drug" for the latter. This is a bait-and-switch.
Paragraph 10: Libertarianism is an unpopular/provocative view. Some people are drawn to unpopular/provocative views. Some of those people end up "merely passing through a libertarian phase" on their way to alt-right views. Therefore...?
Paragraph 11: Libertarianism takes a principled stance on freedom of speech, not just when it suits them (unlike the alt-right). Ok.
Paragraph 12: "Ultimately libertarianism is about peaceful cooperation―markets, civil society, global trade, peace." So libertarianism and fascism/alt-right are antithetical, which undermines the consistency of the phrase "libertarian fascism".
Paragraphs 13-15: Alt-right figure F describes his conversion from libertarianism to alt-right ideas.
Paragraph 16 points out the obvious: Cantwell was simply using libertarianism “as a shield for expressing a lot of disturbing viewpoints.”
The last few paragraphs boil down to the idea that some alt-rightists passed through a self-described "libertarian" phase. True. But this has nothing to do with the idea that there is an "insidious pipeline" from libertariansm to fascism, or that the former is "disproportionately a gateway drug" for the latter.
I agree with the conclusion that libertarians should distance themselves from alt-right and fascist ideas. After all, they're antithetical to libertarianism.
Let's take a step back from the article and return to the original comment. The GP used the phrase "libertarian fascism", yet nothing in the linked article supports the existence of such a thing. The article describes how alt-rightists abandoned libertarian ideas. It also describes a few public figures who claim they're both libertarian and alt-right, while being repudiated by other libertarians for the inconsistency of such a position. This is far from showing that libertarianism and fascism are ideologically compatible, as the phrase "libertarian fascism" seems to imply.
All those ("identifies as X but isn't really") responses bring to mind the "no true Scotchman".
>"Libertarian fascism" is a literal contradiction.
So is war in the name of the "religion of Peace and Love", or being cruel in the name of Christ, or being pro "equality" (like communists) and creating a party elite.
One important aspect of any ideology is not just what it pays lip service to, but how people actually use it, and what it enables its followers to do.
And one common thread in all ideology A is the complain "yeah, X, Y, Z wasn't a REAL A".
Contradictions are the name of the game in all human affairs.
Tons of people chose the most humble public stances purely out of virtue signaling for example (the very opposite of being actually humble), or are "small government" ideologues with very powerful ties and influence in government (which they use to turn towards their private interests).
The Daily Beast had an excellent article on this in August, 2017:
http://www.thedailybeast.com/the-insidious-libertarian-to-al...
Also The New Yorker, "Are Bosses Dictators? | The New Yorker":
https://www.newyorker.com/books/page-turner/are-bosses-dicta...
And though a blog, this also cites Jane Meyer's Dark Money and the Kochs:
https://bennorton.com/the-libertarian-fascist-alliance/
Mark Ames has covered Reason Magazine's Holocaust denial:
https://pando.com/2014/07/24/as-reasons-editor-defends-its-r...
National Review:
https://www.nationalreview.com/2017/08/libertarians-sometime...
The case of William Regnery II, owner of Regnery Press, a libertarian and conservative publisher dating to the 1950s:
https://www.buzzfeed.com/aramroston/hes-spent-almost-20-year...
I suspect this gets a bit off track for the thread, but you asked an I answer.