"I would tell him he has a great shot, as he would then gain a great deal of attention if he actually had credible evidence and countered the previous evidence convincingly." Yes, just like Larry Summers received when he suggested that genetics MIGHT play a role in why so few women are in sciences
The key weasel phrase is "credible evidence." And yeah, it would be tantamount to career suicide for any humanities PhD student to argue in his dissertation that the internment of Japanese Americans was a good idea. (Maybe he could get away with it if he were Japanese.)
Many, perhaps most cultures and subcultures have taboos. In Thailand, you don't insult the King. In Saudi Arabia, you don't insult Islam. And in the American Academy, you don't say anything which might be construed as racist.
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.