The single biggest thing is the difference in law v congregation.
No matter the severity of the offence the law will put on you on a Sex Offenders list and the public then know.
In the congregation no matter the severity if you are deemed unrepentant then NO-ONE in the congregation will know barring the family involved and the elders.
This could mean the offender making a private ministry arrangement with a family's child, without the elders knowing about it, and can easily re-offend.
It HAS to be policy that members of a congregation know because that IS what occurs if the law get involved.