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"the school found that the advocacy for murder was antithetical to the stated mission and standards of the college."
Saying something antithetical to the mission of a university is amply covered by academic freedom. For instance, in a Sociology of Education class I could assign a bunch of reading from Ivan Illich and advocate "deschooling" (the abolition of all schools) in my lectures. Clearly that's antithetical to the mission of the university (schooling), but I have every right to advocate it, test my students on it, and make them write papers on it. Further, I have no obligation to "balance" that with the pro-schooling view (athough pedagogically it makes a world of sense to do so).
(by the way, I'm not a fan of Illich -- it's just an example of something clearly antithetical to the idea of a college or university)