Hitler had camps for Jews. Is there a case to be made that the Jews were actively causing harm and/or intending to cause harm to Germany?
No, I don't think there is. If somebody has rational reasons for saying, "yes," there, then let's hear them.
As far as radicalized people in the U.S. - and here I am assuming that we are talking about radical Muslims - there most certainly is active harm going on, and the intent to cause further harm to the U.S.
Those who support trying to do something about homelessness, for example, are not the same type of "radical." Not at all.
Yes, there is a lot of unfair crap that goes on with the big banks,big telecom, the cable TV company, the dogcatcher, etc. Yet that's not the same thing as killing a bunch of people, setting off bombs, and plotting to do those and more.
In the U.S. there have been terrorist shootings, bombings, and there is a fairly steady stream of arrests of people who were plotting to do more of the same.
The number of U.S. residents linked to terrorism has been on the rise. Some Americans have tried to join ISIS. No sane country turns a blind eye to this type of thing.
"On a national policy level, we need to look at what self-radicalization means. So if these people are radicalized and don't support the United States, and they are disloyal to the united States, as a matter of principle that's their right. It's our right and our obligation to segregate them from the normal community for the duration of the conflict.”~Mr. Wesley Clark
No, Mr. Clark is no different than Sadam or Hitler in the above statement calling for internment camps for US citizens that 'hide' behind the US Constitution to believe how they wish. 'Disloyal' US citizens are those that support wars on homelessness, drugs, foreign citizens in the pursuit of profits. 'Disloyal' US citizens put their self-ish desires above the greater good of the many while holding Mesopotamian laws above US laws. 'Disloyal' US citizens allow the Big's i.e. Big Defense=ULA, Big Pharma, Big Ag, Big Telecom, etc monopolistic-like power and stymie competition. 'Disloyal' US citizens refuse to prosecute Big Banks that support money laundering for extremism and cartels because their supposedly Too Big Too Fail/Jail. 'Disloyal' US citizens, like Mr. Wesley Clark, are politicians pandering to oligarchical establishments over the loyal US citizens that hired them.