I am not sure why so many are demanding that there be an investigation. Perhaps there already was enough of one and a decision was made inside the program. Look at Clemson, they suspended multiple people. Programs deal with program issues and they don't have to become public. I doubt the public will ever hear more than we already have. Just my guess. I understand people want to know more, but there's no obligation by anyone to provide more.
Look at SDSU - Coach gets popped joosing, and the coach discreetly punished himself.