There seem to be a statistical cluster of them happening about now. My view is that yes, it's despicable, slandering students for political purposes. However, the campus proggs are simply following H. L. Mencken's dictum:
"The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, all of them imaginary."
The tenured radicals running the universities keep the students in high anxiety about all the ravening racists & sexists & classists & nativists & speciesists & whatnot lurking around them. Some students, with a natural adolescent urge to be the center of attention, decide to take a shortcut and make the long-threatened "oppression" hurry up and happen. Needless to say, proggs do not take these hoaxes as disconfirming evidence, nor do many of them seem to feel enough of a simple human kinship with those so slandered as to apologize.
I carried on much more crankily about this phenomenon some years back, here, in the aftermath of the Duke lacrosse team case.
Update: Welcome to readers of Blazing Cat Fur, to whom thanks for the link.