One of the values of art is that it offers challenges to how we view the world. The choas of meanings which forms the goal of deconstruction can be excessive when meaning is always denied. Bad logic should be exposed. Any theory or view based on illogical foundations should be exposed. Expose the self-serving.
People often prefer theories, interpretations, and facts, merely because they are self-serving.
It is always a good idea to point out when the views people hold are clearly in their self interest. However, just because an idea is useful to the person advocating the idea, doesn't mean that the idea is wrong. Postmodernism embraces absolute relativism with remarkably little regard for the philosophical consequences. Postmodernism confuses reason with belief. Postmodernism adopts a moral tone which is contrary to its own premises.