Another story along these lines
Here. Most leftists academics are a bit more subtle than this.
This remarkable statement explains quite a bit about how the thinking works on campuses:
Said Brinkley: If a professor taught the "Earth was flat or there was no Holocaust," Columbia might intervene in the classroom. "But we don't tell faculty they can't express strong, or even offensive opinions."
So the implication is that saying the Earth is flat is obviously false and worthy of discipline, but that doubting the existence of al Qaeda and saying bin Laden had nothing to do with 9/11 are just "offensive opinions."
Some outright lies are more equal than others, I guess.
Like I've said many times, when proponents of Marxism are treated exactly the same on campuses as a proponent of Nazism would be, preferably involving tar and feathers, I'll be happy.