If humans were left alone to decide good from evil, we would end up with evil every time... and yes, that is a big problem. There is nothing good apart from God. At this part of the story, we learn about the choice God makes on how to save the world. Even if humans caused problems, God knew that ridding the world of humans would not solve the problem. Keep watching, keep reading, and keep exploring why the word "covenant" is first mentioned as God's response to unreliable humans.