The Niihau Incident seriously freaked out the powers-that-be. A single Japanese airman from the Pearl Harbor attack landed his damaged aircraft on the remote Hawaiian island of Niihau. He had no trouble getting the only three Japanese descendants on the island to help him out. Whether it was indicative of overall Japanese-American sentiment, I don't know.
I strongly believe the internment was wrong, but I was not alive at the time, and can't speak for the people that were.
However, I do agree with Scalia; human nature has not changed that much. A modern Niihau Incident could spark a drive to get conservatives into the concentration camps...unless we fight back.
“human nature has not changed that much”
It hasn’t changed in thousands of years- at all.
Only our circumstances have changed, thanks to grace and our hard work.
Given the same circumstances whatever Man did in the past he will repeat.