The Internment of the Japanese was an over re-action at the time. If it wasn’t then why was not the same done to German-Americans, especially those involved in the American Bund Movement??
All German Americans were on a watch list. Some were arrested, some were “deported” as persona non grata. The difficulty in CA and in HI, was the overwhelming number of indistinguishable Japanese and the potential for an in situ 5th column. There was in both cases quite a bit of cultural bigotry, which Germany and Japan did little to dispel with their “superman” ideology, and bushido.