I think you are arguing with someone else here. I don't recall saying anything about sterilizing workers and forming a strictly heirarchical society, or maybe you mean something other than worker-bee when you say worker-bee. If you think getting rid of greed and malice is somehow going to result in a Brave New World, I really don't know what to say to you.
Look at it this way. What is the purpose of most of our laws? They compel people to be fair and decent to each other, correct? That is all I'm asking. If genetics can help bring about such a state, why not? You might think it's artificial, but the simple fact is, you didn't choose the genome you have any more than you would choose one without greed and malice. Either way, you're constrained by what you're given. At least this way, humanity can have some say in the way they evolve, rather than simply leaving it up to chance.