As I understand it the proposal is to build an Islamic centre at least 2 blocks from Ground Zero and I think that there's a mosque nearby already.
The property is vacant and owned by the people who want to build the Islamic centre, the zoning rules allow it and there is no legal reason to stop it.
The people behind it are not radical Islamists or Al Quaeda supporters.
This really seems a no-brainer. I don't see how the government can intervene without some infringement of liberty and without creating the potential for further infringements. Should we then start to demand the removal of Churches close to the sites of atrocities carried out by anyone who was even nominally a Christian ?