Why does Tiresias refuse to reveal who the murderer is to Oedipus?

Tiresias refuses to reveal the identity of the murderer to Oedipus primarily because he wants to protect Oedipus from the shocking truth of his own actions. Tiresias, as a blind prophet, has the insight to see not only Oedipus's physical circumstances but also the tragic fate that awaits him. He understands that disclosing the truth could lead Oedipus to despair or violent reactions due to the horrifying implications of his actions, which could spur unjust anger against those around him or lead him to a deeper personal crisis. This motivation to shield Oedipus from the dire revelation about himself plays a crucial role in the tension between the two characters, highlighting the struggle between knowledge and ignorance, and the heavy burden that truth can carry.