Minor imput on some line of thought raised earlier in this conversation:
Also, do all CSS themes have a rating module/are they required to have a rating module? I feel like if we're going to have a downvote based deletions policy that should be a thing.
Themes aren't currently required to have a rating module, although most (if not all) that have usage instructions do have a rating module as part of the demo. I believe this may have been standardized in an old proposal of Croquembouche, which didn't pass muster.
Secondly, there are two ways to have a theme, at present, which have different results when deleted. The first are @imports, which will have no visual indication of deletion, and the second is [[include]]s, which will leave a red box that looks like this:
Included page "fuck" does not exist (create it now)
My opinion is that, while staff shouldn't make efforts to remove broken [[include]]s from pages, we shouldn't punish non-author users from removing said elements on their own - in the same vein of making edits to fix punctuation, this is an edit to fix an obvious and glaring error with a page. While it was likely not initially an error, it has since become one, and the spirit (fixing clear and readily obvious flaws) is the same.