Grand jury indictments are hard to come by these days, but the focus might be on the wrong obstacle. The problem is self-policing. When a group or profession self-polices, it does internal investigating and monitoring of its own activities.
Several levels of self-policing exist. An extreme example is a cult society. What happens inside stays inside.
Common examples might include a school or school system, a police department, a sheriff's department, a hospital, a doctor's office, a nursing home, a jail, or any closed system. When the outside world has no idea what is going on behind closed doors, no one but the insiders know the truth. It happens in abusive homes, too.
We have heard, "What happens in Vegas stays in Vegas," "Snitches get stitches," "We don't talk about that around here," "Don't air your dirty laundry," lots of hints that secrets should remain secrets.
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It is privacy like this that brought about Sunshine Laws. People want checks and balances in our society, especially if they have a vested interest, especially if the group is funded by taxpayers.
We have the CDC, FDA, EPA, NASA, DOE, DOD, FEMA, IRS, and a whole host of alphabet abbreviations working for us, and frankly, no one in the public really knows what goes on there.
Who is going to police us? Do we have a gentle friend to pull us aside and say, "Hey, shape up."
Or are we still hiding behind a blue wall (cops covering for cops), white wall (doctors covering for doctors), green wall (polluters covering up and making deals to keep it that way) and the purple wall of coverups in our domestic violence and sexual assault/harassment handling?
So we hold the indictment hearings behind closed doors. That alone would cause unrest, never mind all the other issues.