After moderator attention flags are reviewed the user can see that the flag has been deemed helpful, disputed or declined in their Flagging summary. Sometimes the user may rightly guess why a certain flag was disputed or declined but sometimes they may not.
To educate users and to add transparency to flagging it would make sense to add the option for flag reviewers to give a reason for why they dispute or decline a flag. Note that I wrote "option" because moderators may have lots to do so they should be able to opt out of giving a reason.
If users by getting a reason for having one of their flags disputed or declined learn how to better flag it would be benefiting in two important ways:
- Better flags means that unwanted content gets handled more efficiently.
- Better flags means less strain for moderators.