Why not an extension that makes the "save" button cancel instead? How can you put effort writing a comment if you know it will be deleted before people read it

Why not an extension that makes the "save" button cancel instead? How can you put effort writing a comment if you know it will be deleted before people read it? How can you bear to keep your deleter enabled after you just posted a comment you thought interesting? And quite frankly, how do you justify going into other people's threads and littering them with useless "[deleted]" comments on purpose?