Why does America not have not have a conscience? Because it's largely controlled by non-human entities who don't think, notably corporations.

"King was able to achieve a legal victory through the civil rights movement, portrayed in the new film Selma. But he failed to bring about economic justice and thwart the rapacious appetite of the war machine that he was acutely aware was responsible for empire’s abuse of the oppressed at home and abroad. And 50 years after Malcolm X was assassinated in the Audubon Ballroom in Harlem by hit men from the Nation of Islam, it is clear that he, not King, was right. We are the nation Malcolm knew us to be. Human beings can be redeemed. Empires cannot. Our refusal to face the truth about empire, our refusal to defy the multitudinous crimes and atrocities of empire, has brought about the nightmare Malcolm predicted. And as the Digital Age and our post-literate society implant a terrifying historical amnesia, these crimes are erased as swiftly as they are committed."

That's because the 'empire' is largely ruled by corporations these days.

People just exist to serve its function.

While these corporations profit from their destruction.

More here - http://www.blackagendareport.com/node/14652