"Noah was a righteous man; he was blameless in his age; Noah walked with God". The Midrash Raba that says, "When the storm passes the wicked man is gone' refers to the Generation of the Flood and 'But the righteous is an everlasting foundation' refers to Noah." End quote. We should inquire what this Midrash is meant to teach us. For if Noah was righteous and an everlasting foundation, why did the Generation of the Flood not survive for his sake? "Noah walked with God" comes to tell us that despite Noah's being righteous and an everlasting foundation, the world did not exist for his sake, for he walked among his generation with the attribute of Justice.
He did not ask that they be pitied at all, and did not want to yield any of his credit to them and be punished as they were, as did Abraham with the ten generations. He sought the annihilation of the Generation of the Flood, as did the Holy One, who said, "I have decided to put an end to all flesh", which is why it says, "Noah walked with God". It means he walked among those of his generation of one mind with the Holy One, Who comported Himself with them with the attribute of Justice, and so did Noah, who did not ask that they be pitied at all.