People conveniently forget that there were plenty of Japanese spies on the west coast. That was why they did the internment, they couldn't afford to take the time it would have taken to weed them out by usual methods.
Some of the things that HAPPENED to people who were interned, loss of property, etc., was another matter entirely, to be handled on individual bases, which I believe they have been.
Exactly. I went to school at UofCalifornia Santa Barbara, in classrooms that at one time were PILLBOXES with guns facing to the sea to repel a Japanese attack. It is entirely prudent and necessary to remove potentially dangerous populations from a potential war zone until they can be cleared.