The bow in the cloud is a sign of a covenant but it also tells us something of God's nature in judgment. He will judge the earth, but He does so with much longsuffering.
Genesis 9 ends with a strange episode. We are not told explicitly what happened, but Noah knew exactly what had been done to him and who did it. And after the restitution of the blessing comes cursing. "Cursed be Canaan."
While there is life on the other side of the flood so is there sin. The Ark was Noah's salvation, but unfortunately, it was also a shipping container for sin. Noah isn't the saving son (Gen. 3:15). We need to keep looking.