I am a big privacy guy, especially in today's surveillance state.
But, how many of us have control over how an embarrassing mistake is perceived by the people immediately around us? A big part of what checks our behavior is how others will perceive that behavior. Fear of being ostracized by the herd is as basic of an human survival instinct as drinking water. People knowing and talking about those things is an essential component of social accountability and moral growth.
Your family, your friends, your work mates will notice that your car is gone, the bruise over your eye, needle marks in your arm, that you miss school, work, dinner, etc. People who care will figure it out. We don't live in a bubble. It is from this inner circle that information leaks and propagates, eventually reaching people who don't care at all.
For public figures, that immediate sphere of people who care is much larger. If you are missing, they will only naturally want to know what is going on. It is a basic human nature and while it has it's down sides, can sometimes be petty and gossipy, it has its root source in the basic social nature of man. It is not indecent.
Quitting a Power Conference team sport mid-season is not a private matter. It doesn't even come close to being a private behavior. To boomerang this back on fans wondering what happened to him is twisted.
But those who do know are under no moral obligation to spread the information to anyone else. Not doing so is probably more virtuous than yapping.
If DO has made a sound decision, then public shaming doesn't figure into it. If he did something shameful, then people knowing what he did will be an important part of his learning to be accountable for his own actions. People being made to feel shame is not a social injustice, it is part of life.