The privilege of opening the first trial in history for crimes against the peace of the world imposes a grave responsibility. The wrongs which we seek to condemn and punish have been so calculated, so malignant, and so devastating, that civilization cannot tolerate their being ignored, because it cannot survive their being repeated. That four great nations, flushed with victory and stung with injury stay [stop] the hand of vengeance and voluntarily submit their captive enemies to the judgment of the law is one of the most significant tributes that Power has ever paid to Reason . . .

give me the main idea in 1 sentence

The main idea of the passage is that holding the first trial for crimes against the peace of the world is a grave responsibility, but it is crucial to condemn and punish these wrongs to prevent their repetition and preserve civilization.