What the Bible says about Flood Did Not Change Human Heart
(From Forerunner Commentary)
God's response to humanity's sinfulness was to send the Flood to wipe mankind almost completely from the planet. He would start again with Noah's family, his sons and their wives.
Immediately after the waters receded and the ark was emptied, Noah makes a sacrifice to God for their deliverance. “And the LORD smelled a soothing aroma. Then the LORD said in His heart, 'I will never again curse the ground for man's sake, although the imagination of man's heart is evil from his youth'” (Genesis 8:21).
Did the Flood change anything? Millions of people died, billions of animals died, uncounted trees and other plants died. But the human heart did not change; it remains “evil from his youth.”
Richard T. Ritenbaugh
Are Humans Good or Evil?