Facts of blame are useful. They help us identify problems and where things went wrong, and solve them.
Narratives of blame organize all facts according to an explanation and an enemy that has already been identified. They do not help you soberly identify or correct real problems. They help assuage your instinct to scapegoat and limit a problem so the blame can stay in a safely confined box and a defined solution.
Postmodernism is a problem because it is not concerned ultimately with the facts of blame but with a narrative of blame, a story. And facts that do not fit its narrative are discarded and suppressed. And any criticisms against its narrative can be refuted by saying that you are defending the problem.
This helps no one.
Making Nobody Happy 