What is a Muslim extremist? What does a Muslim extremist believe that every Muslim is not taught and expected to obey? It is the duty of every Muslim to work toward creating a single world order under Islam. Every Muslim who became what you are calling an extremist was manipulated into doing what the Qu'ran commands them to do. Depending on the circumstances of where a Muslim lives depends on the degrees of manipulation that are required. In the end, every Muslim must obey the laws of Islam over any other laws. The laws of Islam defy and have become dangerous to the United States of America on a political basis. We have already been attacked by Islam, more then a couple of times in the past three decades.
If you want to call those Muslims who attack Americans worldwide and who attacked the U.S. on American soil extremists, knock yourself out. Just understand that they were operating under the specific parameters of Islam that all Muslims must operate under.
Islam has always been, by it's very design, an enemy of all free countries. Now! Islam has once again become active in it's attempts to destroy everyone who defies Ilsamic law.
This is so not about religion any longer. Religion is a cover for the anti-American political organization known as Islam.