Well, there’s your problem: you’re evaluating this claim on the basis of two polemical articles with little or no specific quantitative information and a vaguely-defined “general attitude” that you claim to have encountered.
Show us some credible evidence that “whole fields within the humanities” actually HAVE “wandered into a jungle of nonsense and seem unable to get out of it”, rather than merely repeating cherished items of recreational-outrage gossip from the popular press about how post-modernism is destroying the academy, and then we can have a debate about it.
At present, however, you just sound like one of those daytime-talk-show devotees who’s convinced that all Hollywood actors are secretly gay Satanist drug addicts or that the average black female teenager has borne four babies by at least three different fathers. Just because some scandalous behavior gets a lot of play in popular media doesn’t mean that it really represents a significant trend.
Well gosh, that’s mighty big of you.
How nice. Have you ever thought of going out there on that Internet thingy and, you know, looking for some?
Perhaps, for instance, you might enjoy the article “Zhu Shenghao: Shakespeare Translator and a Shakespearean Tragic Hero in Wartime China” in a recent issue of Comparative Literature Studies, by a professor of cultural theory at the University of Montreal and Shanghai Jiaotong University, which describes the early to mid-20th-century literary phenomenon of Chinese translations of Shakespeare and Chinese intellectuals’ responses to encountering Western literary classics.
There are literally thousands of literature studies articles being published every year that use painstaking research to provide fascinating information on serious aspects of literature. Just because every literature-studies research article that you’ve ever heard of may have been a farrago of high-concept post-structuralist gobbledegook cherry-picked by some journalist or popular pundit in order to tsk-tsk about the deplorable state of the academy doesn’t mean that there isn’t a lot of more interesting material out there.
And merely ignorantly asserting that there is a problem will not make it so.
And as long as you can’t even be arsed to tell us what counts as “a significant part of the academic world” and to provide a cite for how much of it really is “acting like this”, you will still fail to have a credible premise for debate.
The problem with “academia’s relationship with the rest of humanity”, at least as represented by you, seems to have less to do with academia’s failure to sustain its intellectual responsibilities, and more to do with humanity’s natural preference for lazily believing cheap bombast and scurrilous gossip over taking the trouble to actually do some research and find out what the facts are.