If I hear those two words used in reference to the World Trade Center site one more time, I'm going to scream.
Just for reference, when the US signed and ratified a treaty with the Lakota after they kicked the US Cavalry's collective butts, part of it left the Black Hills as Sacred Ground for the Lakota, which the US would honor in perpetuity. Then, gold was discovered there, and all of a sudden there were all sorts of reasons to abrogate the treaty. Today, with Mt. Rushmore there, what was sacred ground for one people is now a tourist trap for another.
So, spare me all the crocodile tears about sacred ground. It's a hole in the ground. The best way to honor the dead is to live fully and honorably not cowardly and hate-filled.