The Internet lures American Islamic youth to romantic lives of terrorism, and many American Muslims are hard-pressed but determined to combat it. Such resistance to violent madness is of course obligatory and to be expected as a simple duty; the tougher question is how aggressive American Muslims will be in tracking down the agitators. As under collegiate honor codes, it is easy enough to avoid cheating but a lot harder to turn in a suspected cheater.
The difficulty here was seen in the Japanese American relocation of World War II. Pro-Japan militants would beat pro-Americans in the relocation centers. Finally, a separate facility at Tule Lake had to be established for these domestic supporters of Japan. Brian Hayashi's Democratizing the Enemy (see p. 127 via google search) has a solid account of the relocation. As a professional historian, he presents a range of evidence well, thus allowing the reader to come to conclusions in variance with his own, ultimate criticism of the relocation policy.