Of course, your conclusion has to be based on what argument you are making in your essay -- how you are making the argument. Your conclusion should simply be wrapping up your argument and reiterating the main points of that argument. You should not really be proving your thesis here, just recapping it.
So I can't really tell you how to word your conclusion because I do not know what pieces of evidence you have used to make your point about how the society "defies" human rights. If I were writing an essay on this topic, I would probably end it something like this:
In this society, the Guardians and the society have the power to trample people's rights. The society accepts the idea that "imperfect" children can be killed and the Guardians feel it is right for them to kill parents to get their gifted children. These examples and others show that the society pays no attention to some of the most basic of human rights.