Post History

Currently, those users that know the least about tag policy are the ones generally creating tags.  New users shouldn't be allowed to create tags arbitrarily.  It takes some experience with the site and the tag policy to create good tags and not make a mess (as has already happened).

Tag creation should therefore be a separate privilege.  If you don't have the privilege, you can pick from the list of existing tags when writing a top level post.  That would come with a "propose new tag" area.  If you try to propose a new tag, you are encouraged to look thru the existing list first, and maybe display a short version of the site tag policy.  If you really feel a new tag is needed, you can enter it.  Your post then shows up with that tag, but in a different color or something.  That goes on a review list, like edits do.  Someone with the tag curate privilege can then approve, rename, delete, or otherwise change the tags on your post.