Answer and Explanation:
Creon believed that Polyneices tried to attack his own country and kingdom to which he was chosen by the gods to protect and promote progress and not to destroy, as he tried to do. In this case, Creon believed that a traitor to the homeland should not be buried in the soil of that homeland because it would be disrespectful to all who strive and love the country.
The Greeks of the time could agree with Creon, as they were extremely nationalistic and considered love and fidelity to their nation as something sacred and deserving fidelity.