Why did every living thing on earth perish in the flood, not just humanity?
Genesis 7:21 paints a stark picture of total devastation. It doesn't just mention humanity; it lists 'all flesh that moved on the earth—the birds, the livestock, the wild animals, all the creatures that swarm across the ground, and all of humanity.' This comprehensive destruction underscores the depth of God's judgment against sin.
A World Drenched in Sin
Commentators highlight that the sin of humanity had corrupted the entire created order. Because humans were the stewards of creation and had abused their role, the judgment extended to the creatures with them (Benson, Wesley). This wasn't a capricious act, but a just consequence. God, as the sovereign Lord of all life, had the right to unmake what He made (Benson, Wesley).
Restoring Balance
Furthermore, the destruction served a practical purpose for the future. With humanity reduced to a remnant in the ark, a proportional reduction in animal life was necessary. Otherwise, the unchecked proliferation of animals could have overwhelmed Noah and his family, preventing them from repopulating the earth (Gill, Benson, JFB, Wesley). God's judgment, while severe, was also an act of wise governance, ensuring the survival and flourishing of His chosen line.