Here's a novel thought:
At least some of the points Eco mentioned do not require an authoritarian government to implement. For example, selective populism and racism were alive and well in the South prior to the 60's, and happily administered in a democratic system. It took, yes, a powerful government to break it up.
Removing all power from the government transforms a nation into a state of nature that empowers such fascist and elitist groups to suppress marginalized groups in the same way an authoritarian government would. This is why many neo-fascists and alt-righters pay lip-service to libertarian (or classically liberal) ideals and the two groups often overlap in practice, because a truly stateless nation would allow the "weak" to be dominated by the "naturally strong", ie., this or that better poised group.
Counter-intuitively, a state is required to maintain individual liberty, I think.
PS: To be fair, I think most people who are libertarian do not want the state of nature. For example, libertarians, AFAIK, want a government that protects property rights for example. Yes, I think if one considers Snowden's revelations, these developments don't enable the state's protection of individual liberty arguably. As we've seen, they haven't been very effective while instead are very compromising of individuals' rights.
It comes down to details, but blanket removal of all power the state just places power in the hands of the de-facto elites. It's a delicate balance we have to strike and yes debate.