changed my mind again re: scope of "Challenges"

I think I was (still) flinching away from attacking the Caliph; and
because of that, I thought the analysis of politics belongs in the
somber memoir-post, rather than this critical post. But there's just
so much good stuff in this coda, and it is focused on the comments on
the Feburary '21 post, so it belong here. My job now is to make this
the best draft post it can be; I can always soften it or hold back
parts of it later, on advice of counsel.