I didn't see in the professor's comments where he attacked the student personally or threatened her personally.
His comments are disgusting but he has the 1A right to say them. The professor and the college president have made their choice ... the parents who send their kids to this school need to make theirs.
Actually, Comrade Daly stated in his email that he was going to use his position as an employee of the school to try to discourage others, namely his students and other ones from attending. He also said that he was going to try to intimidate Rebecca and other Conservative-minded students into silence, which doesn't sound like respecting one's Freedom of Speech rights.