Removing it altogether without having to notify the poster makes it appear that they have been judged before a trial.
Just my two cents.
Also, if there has been an "abuse of moderators", how do we deal with them?
If the complaint is about a moderator posting as a regular user (which is the vast majority of their posts), then you may report your concern the same way you would for any other user: using the "Report Post" feature or via a Help ticket as described above. The Report Post feature automatically links to the post you were viewing when you clicked on the link, so it is not necessary to include the extra information requested above when you use this method.
If you have a question about why a post of yours was removed, you can ask one of the moderators or submit a Help ticket or Report Post. Do NOT ask in the forums, as any posts questioning moderation or disciplinary actions will be deleted. Please provide the information requested in the first paragraph above so the person responding can find the topic and post in question.
One thing to be aware of is that removing one post also removes the entire reply tree starting with that post: that is, all the direct replies to the removed post, all the replies to those replies, etc. This is not a matter of discretion -- it's the way the forum software works. For those viewing the forums in flat mode, which is most of the readers, this hierarchical relationship is not visible and they may not be aware of all the posts above them in the tree. Thus, not all posts removed are offensive.
One final note: when a post is removed it is because the content of that post violates one of the forum or site rules; it is not a judgement of the author. As with most other discussion forums I am aware of, there is no guarantee that a user will be notified when a post is removed,