It was therefore inevitable that this creation would fail at some point. When you promised the forefathers that their children would survive and inherit the land of Israel they knew, as did You, that their grandchildren would not be perfect. They knew that You knew that there would be problems, especially given the rebellious nature of their children, and the promised size of the nation. Moshe's argument regarding the other nations was founded upon the same strategy. The Jews were intended to be role models for the rest of the world as how to integrate G-d into their daily lives.
Normal life involves making mistakes.
Normal life includes the expectation that the human will fail. As the Torah relates, G-d accepted Moshe's argument and forgave the Bnai Yisroel. Moshe, through his determination to save his people, had proven his personal claim on the leadership of the nation. He had set the standard by which all other leaders would be judged. As the ultimate servant of G-d, Moshe emulated his Master.