Why didn't God just kill Adam and Eve and start over?

If you take the Flood story literally, you would attribute it to God wanting to cleanse the world of sin. But in the time of Adam and Eve there was a much higher percentage of sinners than at any other point in human history (two out of two). So why didn't God start over right then and there if he wanted to... show more If you take the Flood story literally, you would attribute it to God wanting to cleanse the world of sin. But in the time of Adam and Eve there was a much higher percentage of sinners than at any other point in human history (two out of two). So why didn't God start over right then and there if he wanted to smite sinful humans?
Update: @Loosey: Then I guess the only true answer is, "because that's not how the story goes"
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