For that reason, I believe a mandatory list-field should be available to the moderators when they delete a post in order to select the reason of the deletion (for example "Off-topic", "trolling" etc).
In default the moderator can view the reason if someone reported and the moderator dealing the report has the option to write something in Moderator Comments on why he is taking action so that every other moderator or admin can view, and they have the option to see the detailed report and i am not sure about the permission moderators have in this forum but i am talking about the general SMF forum layout.So in short it is possible by default to comment on the report why they are taking action but it does not mean that they will let every user know why your posts are deleted.
