In other words a lunatic.
It's worth remembering that "libertarian writers" advanced deregulation and climate change denial tropes for decades, and "libertarianism" is itself a billionaire-manufactured and -evangelized sock puppet ideological religion concocted with the help and credibility of Laissez-faire, pro-corporate economists and riding the coattails of a philosophically-bankrupt fiction writer who makes the irrational leap that reality (to a human observer) can ever be a known, unbiased, and concrete certainty.
https://owlcation.com/humanities/The-Virtue-of-Stupidity-A-C...