This edit seems to be restoring a comment to a user's talk page.
Policy does not prohibit users, whether registered or unregistered, from removing comments from their own talk pages, although archiving is preferred. If a user removes material from their talk page, it is normally taken to mean that the user has read and is aware of its contents. There is no need to keep them on display, and usually users should not be forced to do so. It is often best to simply let the matter rest if the issues stop. If they do not, or they recur, then any record of past warnings and discussions can be found in the page history if ever needed, and these diffs are just as good evidence of previous matters.
