It all depends on what pair of glasses you're wearing.
As a secularist in support of the US's freedoms: The Islamic community has a right to build a mosque. One could argue bad taste, perhaps, but they cannot be denied building because of their faith. We shouldn't infringe on anyone's faith, because we all have equal protection under the law.
As a Christian: Not only is it possibly in bad taste and reek of political double standard, but I don't really care if I'm infringed upon their religion. As a Christian, my faith is the Truth of word and faith in God. Anything else, including Islam, is a fallacy created by men. Therefore, they're faith shouldn't be allowed to spread, both for our benefit and for their own, hopefully.