It turns out there was a Muslim prayer room on the 17th floor of the south tower of the World Trade Center, where Americans and other traveling Muslims prayed every day. On September 11th, 2001, when a handful of terrorists flew planes into the towers, some of the folks who used the room evacuated in time. Others probably didn't. In other words, there already was a "ground zero mosque"--used by Muslim Americans who were murdered just like everyone else.