be very careful how you do this, whilst I think that these guys are scum fir their actions, esp on the anniversary of the WTC attack, if there are grieving relatives at the site, you do not want to potentially make the situation worse. You don't want to give the loosers any more publicity, especially not sympathetic publicity, and you defiantly don't want to get into extremely heated confrontations with them, despite the fact that you will be supporting the victims relatives, you dint want to get into a "fight at a funeral".
I support what you guys are doing, hell, If I could afford the transatlantic flight I'd be there with you.All I am saying is think about how you will "interact" with these whack jobs, and how this will impact of any grieving people at the scene, joke t-shirts for example may be seen as taking the piss out of the whole situation, not just the conspiracy nuts.