(A) There is no "islamic community" in this country. Any more than there is a "white community." The affiliation is by national origin and religious sect - e.g. Shia, Sunni, Sufi - and is not a monolithic bloc. They do not communicate with each other. They don't have time to. They have jobs, families, taxes, and relatives back where they came from.
(B) Even the 9/11 terrorists did not advertise "I am a terrorist" nor did anyone, anywhere, think their actions would lead to what happened on that day. This of course includes our "counter-terrorism experts" subsidized by the US taxpayer.
Fact: lots of our wonderful "moderate" moslems knew the hijackers very well, even living with them. However, all of them today claim that "they didn't know a thing".
(A)The hijackers did not mingle too much with anyone, Islamics or non-Islamics. The idea that there were hundreds of people out there who knew and did nothing is absolutely, totally, false.
(B) Again, none of these people advertised "I am a terrorist" to anyone, anywhere. Did the US government have any alerts out to the Islamic community to be on the lookout for terrorists? No it did not. Hindsight is 20/20. The Al-Queda manual had explicit steps to tell their people how to avoid suspicion and there was no reason to suspect them at the time.
Fact: it is impossible to tell the "moderate" moslems from the covert terrorists waiting for their mission. Fact: we are in a war, and in a war you don't permit your enemy to shelter in sanctuaries, whether it is a mosque full of soldiers in Khandahar, or an "islamic center" in Trenton which produces jihadists like a factory.
You can't. I can.
There is 1000 times more justification for the internment of arab moslems from named countries who have come to that USA in last ten years than there ever was for interning the Japanese.
Most of the 9/11 attackers were not legal residents. Some of them even had immigration violations at the time they carried out their mission. But I'll put you down as a vote to intern and deport. You do this because I'm sure you think it will make you feel safer. I'll put myself down as a vote not to. I'm not going to die many times before my death.