Hey Helen. You might want to check out chapter 9 of Scruton's recent "Fools, Frauds & Firebrands". It's *exactly* your topic. He sees things a bit like you - PM is primarily political - though a more restricted take on what constitutes PM. He calls it the "nonsense machine".
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Not all of it is relevant, but that particular chapter is right on topic. He basically argues if you want to understand what's going on in postmodernism don't look for meaning - it's actually a political intervention designed to place adherents on the side of "justice"/"good".
Though having said that he does suggest that those kinds of postmodern texts can be read as being entirely self-referential, so in that sense they do constitute their own "truth" - albeit Deleuze, Guattari and Lacan all explicitly disavow truth as legitimate aim.
