Postmodernism is legitimized Calvinball. In a rational world, that would be the end of it, in ours, it becomes a federally sanctioned and teacher's union approved kindergarten curriculum.
You've read Ayn Rand so I know you know the true purpose of postmodern and deconstructionist thought is to substantiate the authority of postmodernists and deconstructionists themselves - who, as you rightfully point out, couldn't feed themselves, let alone others. This is the "trick" they play to betray us into granting them the authority to decide everything. Their obtuseness isn't a sign of their ignorance, it's their strategy, as it was in the French Revolution and has been since the collapse of monarchies and emergence of "democracy". They presume that whatever wealth a society enjoys in the moment is a fixed commodity - it just "is" - and exists for them to benefit from and to decide how to apportion among us, those who produce it. And when that runs out, they shoot the farmers who betrayed the whole thing. Very little is new under the sun.
You've read Ayn Rand so I know you know the true purpose of postmodern and deconstructionist thought is to substantiate the authority of postmodernists and deconstructionists themselves - who, as you rightfully point out, couldn't feed themselves, let alone others. This is the "trick" they play to betray us into granting them the authority to decide everything. Their obtuseness isn't a sign of their ignorance, it's their strategy, as it was in the French Revolution and has been since the collapse of monarchies and emergence of "democracy". They presume that whatever wealth a society enjoys in the moment is a fixed commodity - it just "is" - and exists for them to benefit from and to decide how to apportion among us, those who produce it. And when that runs out, they shoot the farmers who betrayed the whole thing. Very little is new under the sun.