How is the origin and basis of libertarianism subjective. And again how are Western political Scholars authoritative. Capitalism literally existed back when libertarianism was created. They specifically chose to create an ideology outside it.
Calling unfettered capitalism libertarianism in no way reflects libertarianism as it was created. Claiming that the freedom of capital is equivalent to actual freedom is an absurdity. If you have access to a freedom that others do not. Due to anything like capital or resources that's not a freedom. That's a privilege and should not be protected.
Likewise, the non aggression principle. Capitalists or any other group claiming to abide it's definition of private property can't also unhypocritically claim to abide the non-aggression principle. Private property demands aggression and violence to enforce it.
If a homeless starving man walked into or broke into a wealthy person's second, third house, or yacht. Knowing that this season or time of year they would not be there. And took a tchotchke in order to be able to afford to feed themselves. What would the response be? Would it be understanding and assistance? Or would they be chased down by armed men and most likely locked up and deprived of freedom for a considerable amount of time? Better yet would a wealthy person face remotely the same response stealing from poorer people?
Remember post ex parte appeals to Authority can always be overridden by just pointing to the origins of the ideology and the fact that for a century there were no accepted right wing Libertarians.
In its day the remotely closest thing to what we would consider a modern libertarian were those like Friedrich Hayek. Who was then considered an outsider and Fringe group to what was recognized libertarianism. Not to mention if I'm not mistaken came along well after the establishment of the ideology. Simply seeking to repurpose it. If he was considered Fringe and outside the mainstream. How then can his viewpoints be considered what was always intended for libertarianism? Not revisionism but main stream. Clearly it wasn't. But maybe you have some writing and evidence from the ideologies origins. Writings that aren't Hayek's or his acolytes Rothbard or Friedman.
Rothbard considered the modern founder of rightwing libertarianism. Again almost a century after the ideologies founding. Openly just rebranded classic liberalism. Which again, wasn't libertarianism. But a separate incompatible ideology. Though claiming to have similar goals via different policy. The claims have never been proven however.
So if were gonna debate let's debate. What actual support for your claims do you have?