Indiana U. says can't fire professor over his 'racist, sexist, and homophobic' views

Strong statement from Indiana University that has its hands tied.

https://provost.indiana.edu/statements/index.html?

https://www.nbcnews.com/news/us-news/indiana-u-says-can-t-fire-professor-over-his-racist-n1089576

Is this sufficient or could more have been done? When do constitutional rights of one individual go too far or do they not?

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http://talk.collegeconfidential.com/parents-forum/2164383-on-the-first-amendment-indiana-iu-kelley.html#latest