The recent plot to bomb Washington, DC's Metro system was uncovered because a Muslim informant went to the FBI. Also, the plot involving cargo bombs on planes was revealed by a Muslim member of Al Qaeda who surrendered himself to Saudi Arabian authorities. The Saudi government, which is crawling with Muslims, then alerted the United States.
So how should we thank all these people who helped save innocent American lives? I know! Let's let them build a mosque at Ground Zero!