Sorry, First and foremost these people are American Citizens.
American citizens that are Muslim put their religion first. They love the riches that America has to offer and yet refuse to decry the despicable terrorist acts of beheading innocents loudly and publicly. They will not speak out against their Muslim brethren.
Your knowledge of Islam seems superficial at best. I have a number of Muslim friends and aquaintances and most take their religion no more seriously than I take mine.
I am reminded of an incident here in Arizona shortly after 9/11. Some brain dead honky walked up to a gent wearing a turban and killed him. The dead guy was a Sikh from India. The differences between Sikhs and Muslims are so vast and antithetical that you and I and Osama bin Laden should be going to church in the same building.
Like that does not happen with the majority of religions. LOL.