Historians Against Trump

I'm not sure if you have seen the article from the Times, but Ken Burns and David McCullough have gathered togethers some of our most prominent presidential historians/biographers to make their opposition to Donald Trump known.

http://www.nytimes.com/2016/07/13/nyregion/donald-trump-david-mccullough-ken-burns.html

I'm curious what you all think of historians making this kind of judgment on the present moment. Obviously they are free to say what they want, but are they overstepping? Does their historical work give them a better insight on one's suitability for the office?