Jawaban:

Poststructuralism encourages a way of looking at the world that challenges what comes to be accepted as 'truth' and 'knowledge'. Poststructuralists always call into question how certain accepted 'facts' and 'beliefs' actually work to reinforce the dominance and power of particular actors within international relations.

They think truth is up for debate: your truth and my truth may be completely different. To use a simple example: a Hindu and a Christian have fundamentally different ideas about whose god is real. These two people have different ideas about the 'truth'.