What you're describing - post structuralism - is actually a kind of cult. A belief system to which people swear fealty, but cannot be explained rationally, nor understood intelligently. Unless the cult beliefs are accepted first, as a kind of background.
That's why they hate conservatives. We're apostate heretics. Even though we're not monolithic.
Actually, it's a tool for analyzing communications. It's similar to the process of diagramming sentences, only on a more abstract level that can be applied to sculpture, writing, music, or rituals. The point is to break everything down into a power struggle. You find the opposing forces and their position of equilibrium, and then you analyze the mechanisms they employ. All linguistic culture ("text" to the post-modernists) may be analyized ("deconstructed") this way.
There is nothing cultish about this in and of itself. The Koolaid is tainted when the student of culture forgets that absolute truth, such as the laws of physics, remain unchanged by his own perspective.
Most post-structuralists are like children who, when they discover the theory of relativity, think they can jump off the roof and time travel to avoid hitting the ground.