"Should a 15-story mosque and Islamic cultural center be built two blocks from the site of the worst jihadist atrocity in living memory? Put this way, the question nearly answers itself. This is not to say, however, that I think we should prevent our fellow citizens from building “the ground zero mosque.” There is probably no legal basis to do so in any case—nor should there be. But the margin between what is legal and what is desirable, or even decent, leaves room for many projects that well-intentioned people might still find offensive. If you can raise the requisite $100 million, you might also build a shrine to Satan on this spot, complete with the names of all the non-believing victims of 9/11 destined to suffer for eternity in Hell. You could also build an Institute of “9/11 Truth,” catering to the credulity, masochism, and paranoia of the 16 percent of Americans who imagine that the World Trade Center was intentionally demolished by agents of the U.S. government. Incidentally, any shrine to conspiracy thinking should probably also contain a mosque, along with a list of the 4,000 Jews who suspiciously declined to practice their usury in the Twin Towers on the day of the attack.