Universities have the right to say who attends, and a right to revoke the enrollment of those who break their policies.
Unless you want to make public universities a completely government controlled service, with free admission for all. But I doubt your libertarian ass wants that.
At least read what I wrote first...
If you want an answer to that, then yes. It's 2015, sorry it's no longer okay to be racist.
So would you support expelling the students who have made threats of violence and bigoted speech towards greek members not-affiliated with this event?
Yes.
And frankly, I don't think it was justified to expel them for using the N-word. I think was justified to expel them for singing about lynching black students before letting them join. Incitement to murder should be grounds for expulsion.
While I am not familiar with the content of their lyrics, singing about committing murder is not incitement to murder per se. If they are inciting, they should be tried in a court of law and expelled should they be convicted.