I had this idea but today I read "This Modern World" and it motivated me to get off my sofa and diary this.
Those who have taken the position that the 9/11 attacks were an assault by Islam on a Christian America, it makes some sense to prohibit a Moslem-use building at the site of the WTC. So let's carry this to the other wing nuts (more below the fold).
There are those who claim that the Jews and/or Israel were responsible for the attacks. Therefore, we should ban any Jewish-use building such as a synagogue at the WTC site.
And there are those who claim that the US government or some elements thereof carried out the attack, faking some or all of the evidence that suggested otherwise. Therefore, we should ban any Christian-use building such as a church at the WTC site.
Therefore, I suggest a shop selling copies of the Declaration of Independence and the Constitution, as well as guns and ammo, for this particular spot in NYC. And tea pots and tea bags. Lots of tea bags.