The theme of the book of Judges is Israel’s rejection of God as ruler over them, and subsequently his Law-Word as binding. With this rejection of God’s Law-Word, man became a standard unto himself, and proceeded to do “whatever was right in his own eyes”.
As we bring the book of Judges to a conclusion, we see this theme ever so clearly. If God’s Law-Word is rejected, man operates and attempts to structure society in terms of his own standard: a man-made standard. He attempts to make restitution for sin apart from God’s law and the results are disastrous. Even through all this, we must realize God’s faithfulness to his covenant promises. He brings judgement and blessings as man deserved. He is just and the justifier of all those who call upon His name.