Oedipus and Laius aimed to see that the prophecy of the family will not occur. They both believe that destiny change can happen if an individual is ready for actions and consequences.

Killed Laius his father and married his mother, Jocasta

Through the servant who fleed to Thebes as a survivor

Justification of the  actions that the prophecy cannot be true

The chorus advice to Jocasta is to avoid pride as the gods will not exist where there is pride

Yes she does as she does evaluation accepting that the prophecy was indeed true