Unlike the Japanese-Americans, The Islamists in the US do pose a real threat to the US

Appropos the obituary of Mr. Korematsu, a Japanese American subject to exclusion during wartime for personally doing nothing wrong comes this story:
Jihad in America's Public Schools From Little Green Footballs:

Kifah Wael Jayyousi, arrested Sunday at an airport in Detroit, Michigan, was chief facilities director for public schools in Washington from 1999 to 2001. But in the years running up to that high-profile position, he supported “violent jihad” in Bosnia, Kosovo, Chechnya and Somalia, according to a criminal complaint unsealed Monday....Jayyousi, a U.S. citizen originally from Jordan...

Unlike the Japanese, we have Arabs in the US, including citizens clearly supporting terrorism and jihad against the United States. Mr. Jayyousi is merely the latest in a great number of such. Considering that Korematsu is still on the books activitiesd such as those conducted by him and his ilk are not exactly the brightest course of action.

While exclusion and internment were reprehensbile when applied against the loyal Japanese Americans, at some point the American public may become less tolerant and demand such action against those who clearly are harmful and disloyal and represent a clear and present danger today.