Granted that there almost certainly are, what do you want to do about it? Re-open the WWII internment camps and lock up everyone of a certain religion or ethnicity? We have this little document called the Constitution that says the government can only deprive you of life, liberty, or property with due process of law.
Or maybe after the OKC bombing you wanted the government to lock up everybody who was a conservative?
You wake up and smell the coffee. Overreacting against innocent people who happen to of a certain religion or ethnicity will only trash our country. There is a danger in living in a (somewhat) free society. Get used to it.