Lawprof Scott Gerber complains about "The Radicalization of American Legal Education." Does it hurt law students if lawprofs lean way left of the general American populace? And should "does it hurt law students" be the question? It's the first question I think of, but it's followed very quickly by the question whether it hurts their future clients and then by the question whether it hurts the country more generally.
I'm not really sure what the great harm is. There is a natural tendency, I think, for people on the left to congregate in academia. Not because they're smarter. They're just less likely to feel at home doing the more lucrative things you can do if you are good at intellectual work. Professors have always differed from nonprofessors, and students and society have always dealt with these differences and figured out how to take what is useful from their education and to reject what is not.
That's not to say things couldn't be better. It's easy to imagine idealized law schools, places full of vigorous debate. But if I enjoyed living in a dream world, I'd probably be a lefty myself.