Often or very
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Answer:
Because King Laio's killer is unpunished.
Explanation:
When Oedipus becomes king of Thebes, the city is forced into a plague that threatens the fertility of nature and women. People afraid of what might happen demand that the king take action, which makes Oedipus research and seek how he can end the plague and make the people safe.
He consults the oracle and learns that the city was forced to plague as a curse because King Laius's murderer was not properly punished. With that Edipo begins a search for Laio's murderer and discovers that the murderer is himself.
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