Another issue is that the local law enforcement apparatus was frankly broken. Ingham County prosecutor Stuart Dunnings had refused to press charges against Larry Nassar; Dunnings later served time for among other things abusing his power to coerce sex from a woman.
See here:
And here:
I’ll add that the current chancellor, former governor John Engler, seems far more interested in forgetting about the whole damn episode than in making sure it doesn’t happen again.