In every possible configuration of a society there are flaws, many of them unseen, unpredicted and invariably those flaws set the scene for a societal change of some sort. What might be called Modernists reckoned it was possible to do something about those flaws, and when you're talking Modernists you're really talking from the Age of Reason to not so long ago. Modernists have an understanding of truth, it's got a capital T and it's out there even if it might be just beyond grasping in an absolute and certain way.
Post Modernists agree with this, but for Post Modernists one of the flaws in society was the capacity of powerful interests to control how truth was perceived. Indeed it wasn't the Post Modernists that caused the current conundrums, rather, from Tobacco is Good for You all the way to Climate Hoax their suspicion around the motivations of sources of information is demonstrably justified. Short term, the whole thing's a sort of basic hedonistic idiocracy stumbling toward extinction, but long term we learn our painful lessons. Small comfort it's all part of the tapestry.