Ethics of Reciprocity

It's a very simple concept, better know as "The Golden Rule", or more better understood with the well know quote, "Do Onto Others as you would with them to do onto you", it's such a basic idea that applies to humanity and the right that we all humans are born with, and which I would also include all living creatures. I think in this day and age with all this news of genocide and war and poverty and corruption and violence we've forgotten what rights we should all try to convey in our daily life, all religions have this concept inherent within it, I present some quotes I found on Wikipedia here:
Buddhism: Putting oneself in the place of another, one should not kill nor cause another to kill.

Baha'i Faith: "Ascribe not to any soul that which thou wouldst not have ascribed to thee, and say not that which thou doest not." -Baha'u'llah

Christianity: "So in everything, do to others what you would have them do to you, for this sums up the Law and the Prophets." -Matthew 7:12

Confucinism: "Never impose on others what you would not choose for yourself." -Analects XV.24, tr. David Hinton

Hinduism: "That one I love who is incapable of ill will, And returns love for hatred." -Bhagavad Gita

Islam: "Hurt no one so that no one may hurt you." part of the Last Sermon of the Prophet Muhammad

... And the list goes on, it can be found in all religions that exist in the know world. So why is it that we've come to live in a world where this simple principle is no longer practiced? Why do people find other reasons to justify violence and ignore the right that every human should have. I don't know what has happened to this world, all I know is if we continue to ignore this principle we will learn to grow even more distant as a species and eventually no one will remain to defend their beliefs. Here's to the hope of a more peaceful world...