Let's assume that given what people knew at the time, it was a good idea. Don't you still think that today it would still be "widely recognized" as a bad idea?
Actually, historians, including some of my colleagues at the Ohio State history department, have found that the internment was not based on credible information, but an rampant anti-Asian racism. By comparison, Germans were left alone, with no restrictions of any sort on their civil liberties, not to speak of internment.
Here's my op-ed that uses long-term orientation, probabilistic thinking, numeracy, consider the alternative, reaching our actual goals, avoiding intuitive emotional reactions and attention bias, and other rationality techniques to suggest more rational responses to the Paris attacks and the ISIS threat. It's published in the Sunday edition of The Plain Dealer, a major newspaper (16th in the US). This is part of my broader project, Intentional Insights, of conveying rational thinking, including about politics, to a broad audience to raise the sanity waterline.