Boston mosque: rise of radical Islam in America?

The Christian Broadcasting Network has this article posted on its site.

• A mosque is rising in the heart of Boston. Not just any mosque, but the largest mosque in the northeastern United States.
• The Islamic Society of Boston is under scrutiny for ties to radicalism. But the society says it does not tolerate extremism. And yet, some former and present leaders of the society have been tied to extremism.
• Dr. Yusef al-Qaradawi used to be listed as one of the society’s four directors, on IRS forms. In 1995, Qaradawi told his followers, "We will conquer Europe, we will conquer America!" The society says listing Qaradawi as a director was an “administrative oversight'' which, it says, “was subsequently corrected.''

• Dennis Hale, a Boston College professor, said, "This is a smokescreen. This is deception."
  Hale heads Citizens for Peace and Tolerance, a group that wants the Islamic Society of Boston to come clean about its ties to radical Islam.

• Hale remarked, "This is a mosque that combines Wahabbi theology, Muslim Brotherhood politics and lots of money, and that's a very dangerous combination. Everywhere in the world where that's been found, bad things happened."
• But the mayor's office, as well as The Boston Globe newspaper, have brushed off concern over the mosque. In fact, the Boston Redevelopment Authority under Mayor Thomas Menino sold the ISB the land for the mosque for a song; one half or one quarter of its true value.
• Former Harvard professor Dr. Ahmed Mansour says when he visited the present mosque in Cambridge with his wife, he found Wahabbi reading materials that preached hatred toward America.

Why can't the American left see that allowing people like the Islamic Society of Boston to set up shop will lead us to what's happening in Holland right now?