The Eden myth, by the way, is not only about human nature, it is also an explantation or why we have agriculture. Of course, the real reason was not sin, it was population pressure because we followed the command of God to be fruitful and multiply. Too many people lived to continue a hunter gatherer lifestyle. That is the real reason, but the author of the story, who copied it from Sumeria or Babylon, was not a scientist.  If Adam, who was not the first man but may have been the first farmer, authored the story than he was moaning about his workload.