I think you're missing some important Spiritual insights into what is happening in the Noah account.
Genesis 6:11-13
11 The earth also was corrupt before God, and the earth was filled with violence.
12 And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth.
13 And God said unto Noah, The end of all flesh is come before me; for the earth is filled with violence through them; and, behold, I will destroy them with the earth.
All the flesh of the earth besides Noah had been corrupted. The earth was filled with violence, and with wickedness.
Now, following this God did something extraordinarily amazing. He established His Covenant with all flesh through Noah and set His Bow (the Rainbow -- which is tremendously beautiful by the way) in the Clouds. This is God showing love, grace, and mercy, and it is also one of the accounts in the Redemption Plan that God laid out for the redemption of Mankind following Adam's transgression. So much more was happening here than God drowning flesh off the drylands.
God Hates sin,
but He loves every person.
He hates sin.
But He God loves every person...
John 3:16 is a passage for SAINT & SINNER alike for the reconciliation, restoration, and redemption of saint & sinner.
It reads,
John 3:16 is a well-known verse in the Bible, often summarized as: "For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life