Genesis 9:1 And God blessed Noah and his sons and said to them, "Be fruitful and multiply and fill the earth. 2 The fear of you and the dread of you shall be upon every beast of the earth and upon every bird of the heavens, upon everything that creeps on the ground and all the fish of the sea. Into your hand they are delivered. 3 Every moving thing that lives shall be food for you. And as I gave you the green plants, I give you everything. 4 But you shall not eat flesh with its life, that is, its blood. 5 And for your
lifeblood I will require a reckoning: from every beast I will require it and from man. From his fellow man I will require a reckoning for the life of man. 6 "Whoever sheds the blood of man, by man shall
his blood be shed, for God made man in his own image. 7 And you, be fruitful and multiply, populate the earth and multiply in it."
After the flood, Noah and his sons were given the command to be fruitful and multiply to populate the earth again. The Lord protected His people from the land and air creatures so they could accomplish His will. The Lord provided all the material provision Noah and sons would need to accomplish God's will. We can also expect God's provision and protection so we will accomplish all He has given us to do.
God gave the death penalty to any man that murdered another man because man is made in the image of God. The death penalty for taking another person's life is what is the right thing to do.
We are to live daily expecting the protection and provision of God as we go about living according to His will. God protects society from murderers by the death penalty.