Muslims have every right to build a mosque anywhere that it is legal to do so. And all the protest in the world won't stop it. Don't like it there? Get the city to zone against churches and religious buildings there.
They wouldn't do that. There are two very old, very beautiful churches there, both of which were very important to people on 9/11, one of them being Trinity Church.
I have a problem with people protesting against moderate muslims who want to show their commonality and support. Terrible message to send. Obviously, they can protest as they want, but that doesn't make it the right thing to do.