There was no explanation in the thread. But there was an explanation in another thread.
If the post is innapropriate, there doesn't need to be.
I believe that the mods know what to delete and what not to.. otherwise they wouldn't have been given those priveliges in the first place
Actually this is a property of Conitec and they can do whatever they want. But it is a good habit to let people know why you do something in a public visible area.
And since you are new, I can tell how the moderators have been chosen:
There was a thread in the Conitec section of this forum calling for new moderators. Just in a few minutes some people responded to become a moderator. They just became, all of them, as I can remember. And some of them are very skilled, experienced and some others are not.