It's that thing again about what science fiction can do for us: it takes abstract ideas about what life is like and makes them concrete so we can study them more clearly.
*loves sci-fi*

Never ignore a coincidence allegory!
I certainly will when I need to stay on point. If I went into all the Kazran = the Doctor parallels the post would have been ten times longer. *g* Also, I figure you want to tackle that in your post?