This is politics and religion, it shouldn't be on HN.<p>But it's here, so... From a logical and humanist point of view I would say that the FBI looking out for people who adhere to violent and radical philosophies is a valid activity no matter if the background is islamic or not. There is certainly a point to be made that mainstream Islam is more radical than the mainstream of many other religions on the basis that it is one of the last mainstream movements violently opposed to human rights and democracy. Whether that is universally true I cannot verify and I doubt the FBI can either.<p>I certainly know a few Muslims who are about as pious as the average Christian who only goes to church when weddings and funerals are taking place. Whether those people are mainstream Muslims and mainstream Christians as opposed to "mainstream citizens" I cannot say and it would probably be counterproductive for law enforcement to make assumptions on what "mainstream" actually means in practice.