Talulah said:
The idea is to let people replace the bad tags with something better. You could have done this yourself, of course, instead of making these BURs, as the tags only have a couple dozen posts each.
But that could be done right away, before approving the BUR, like Pokeball99 suggested. Assuming that there's anything worthwhile to replace the nuked tag with.
Like I said in my original post, I considered just getting rid of morbid on my own, but decided against it since the tag was old and had an old wiki page, making its existence somewhat "official" in my mind. If other users agree that I'm making unnecessary fuss about this (and somber and desolate), then I'll be more bold with unilateral nukes from now on.