Because they have the RIGHT to express their opinions on the topic. They PREFER that the mosque be moved further away from the site where muslim fanatics killed thousands of Americans (yes, including peaceful Muslims).
Like it or not, fair or not, 9/11 will always be associated with Muslims. It is a psychological response and while I personally think it is silly to try and put a 'sensitivity' distance on how close a mosque should be, I can also understand why some just want it further away. I don't think it is bigotry to ask for the consideration of moving to another location.
i know morons like Cypress want to paint everyone with the bigot brush, but 61% of New Yorkers don't want the mosque/community center built in that location.
Do you really think they are all bigots?