Speaking as a liberal...
I find it unconscionable that this student is being threatened with the deprivation of his education, and other sanctions which (as has been pointed out above) may have serious ramifications for his future (including exercise of his right to carry a weapon - whether I agree with concealed carry or not isn't the point; it's his right - and also his pursuit of his education elsewhere). There's a lot in his email with which I disagree; I happen to think that if there were a lot of armed students at Virginia Tech and someone sent around a message stating that an armed student was shooting people, well, the potential for what might be termed "blue-on-blue" incidents is obvious. That isn't the point, however; he has a right to his opinion and a right to state it, and to threaten him for doing so is utterly wrong.
"He wasn't being threatening, though he was being belligerent. He was expressing a controversial opinion, but universities are supposed to support free speech. I would like to see the university forced to take him back, remove any poor marks on his transcript, and compensate him for lost future income based on getting his degree late due to this incident." - daniel
QFT; so what if I think he's mistaken - I might be. The point is that no society is free in which the mere holding and statement of an opinion is a punishable offence. Inasmuch as (being a liberal) I support freedom of speech for those I agree with, and deplore the ongoing removal of liberties from us all, I equally support freedom of speech for those whose views I might deplore.