Regular editors are humans too. Although some editors have been here since time began and have god-like edit counts, we all make mistakes. The worst thing you can do is to bite them. Even if they have deleted the Main Page. Just because you don't think a regular editor should have done that or said those things, it does not give you the right to bite them, even if they are being nasty. The best way to deal with this is to talk with the editor; this is not just dumping notices and warnings on their talk page. Conversation and debate is what makes the wiki better.