Bloomberg’s implication is clear: If the proposed mosque were controlled by “insensitive” Islamist radicals either excusing or celebrating 9/11, he would not support its construction.

But then, why not? By the mayor’s own expansive view of religious freedom, by what right do we dictate the message of any mosque? Moreover, as a practical matter, there’s no guarantee that this couldn’t happen in the future. Religious institutions in this country are autonomous. Who is to say that the mosque won’t one day hire an Anwar al-Aulaqi — spiritual mentor to the Fort Hood shooter and the Christmas Day bomber, and onetime imam at the Virginia mosque attended by two of the 9/11 terrorists?

An Aulaqi preaching in Virginia is a security problem. An Aulaqi preaching at Ground Zero is a sacrilege. Or would the mayor then step in — violating the same First Amendment he grandiosely pretends to protect from mosque opponents — and exercise a veto over the mosque’s clergy?