It was a funny place I was coming from at the time, more immature, more misanthropic, and, most importantly to this subject, with worse tastes, exemplified by two facts: 1, I genuinely like Frank Miller and 2, I didn't like or get Superman.
I like to think I've gotten better in each case, but thinking back on what might have inspired this, but if you get through all the weird and bad ideas, DK2 was sort of a vindication of the government lackey Clark was in DKR. Over the course of it he went from subjugation, to rebellion, and finally to ascension. In fact, if you wanted to over-analyze and read way too much into a book that really doesn't deserve it, one could even argue Bruce's role was something like John the Baptist, the prophet preparing the way for the coming messiah, being Clark. But then, you could jut as easily argue that that messiah was Hal (though at least this was before GL: Rebirth, when DC starting pushing that line), so reading too much into DK2 will always turn out to be a mistake. I could be completely misremebering all of this, sine it's been years since I read it.
I still love the crack that is the First Church of the Last Son of Krypton, but that whole thing with Dick was dumb dumb dumb. DK2 is never really sure whether it wants you to groan or laugh.