There are definitely forums that don't inform you of why your post was removed because they think that trolls will use this to basically probe the defenses to see exactly how much they can get away with. Making the moderation more obscure is thought to make them more reluctant to try things. I personally don't think this works, but it is the theory.

However, it is important to consider how bad actors will abuse your system if given the chance, because on the internet there will always be some trolls trying to burn your house down.