Actually, in the story it's implied that God just decided he wasn't going to do all the work anymore. He turned it over to the misbehaving children.
In reality, the story represents God's gift of Freedom and that in all things, man's Free will was to be exercised not only to choose between good and evil, but to choose life over death. If you do not hunt, or work, you will not eat.
Ok. Once again, you should read your Bible. It is not good to have zeal without knowledge:
Genesis 9:1-6
God's Covenant With Noah
Then God blessed Noah and his sons, saying to them, "Be fruitful and increase in number and fill the earth. The fear and dread of you will fall upon all the beasts of the earth and all the birds of the air, upon every creature that moves along the ground, and upon all the fish of the sea; they are given into your hands. Everything that lives and moves will be food for you. Just as I gave you the green plants, I now give you everything. "But you must not eat meat that has its lifeblood still in it. And for your lifeblood I will surely demand an accounting. I will demand an accounting from every animal. And from each man, too, I will demand an accounting for the life of his fellow man.
"Whoever sheds the blood of man,
by man shall his blood be shed;
for in the image of God
has God made man.