Since truth is not discovered but constructed, there are many ways of putting together a plausible explanation. Constructing a model that accounts for the evidence is the best that we can do, and one model is just as valid as another. By this way of thinking, spin is literally everything. Since truth is not an absolute, it can be continually revised, without even worrying about contradictions. If there is no truth, it is impossible to lie.
Truth is a matter of interpretation.
Postmodernist scholars are obsessed with hermeneutics, the process of interpretation. Truth-claims, because they are constructions of language, are subject to endless reinterpretation and are incapable of any definite, fixed meanings. Thus, note the excruciating exegesis of common language that is accompanying the scandal. Telling someone to be evasive is not the same as telling them to lie. Postmodernists have learned how to make words mean anything they want.