I'm happy to give you a break. Your equations are not analogous. Let me correct them for you...
Nazism is to Germans,
Is as Communism is to Russians,
Is as Islam is to Arabs and others who've fallen under its sway.
It is brutal and oppressive everywhere it's tried.
And like Nazism and Communism, Islam has plenty of apologists here, who claim the the evil excesses don't represent the pure form of the doctrine.
Not all Nazis were murderers, not all Communists were murderers, and not all Moslems are murderers.
So what?
Isn't this called guilt by association? The terrorists who are responsible for 9-11 aren't religious at all in my book. They just wrap themselves in the cloak of being defenders of the faith of Islam. Its a way for them to look good to a small group of radical Muslims, and a way for them to try and fool themselves that they are nothing more then butchering animals