If you're bothered by the thought that deconstruction and poststructuralism might really be as nihilistic, self-serving, and pompous as many critics say they are, give Homi Bhabha's "The Commitment to Theory" a go.
As you read it, ask yourself: how does Bhabha describe the relationship between political activism and theory? How does Bhabha's concept of hybridity critique other poststructuralist interpretations of identity? You might just find something uplifting amidst all the highfalutin lingo.