Now that I've had the chance to think about this (it's been percolating since last night), I had to come back and leave more comments. The story can absolutely stand on it's own, but it leaves so many tantalizing questions:
If El Diablo is as amoral as he's presented here, then why the disguise at all? What has he to gain from getting a normal job and acting like a human at all? Why wouldn't he just take whatever he wanted?
Since this Clark hasn't aged a day in twenty years and appeared to be an adult when Perry was in Beirut, then I had assumed that he hadn't been raised by the Kents. My assumption was that either he arrived as a baby and was found by the government and trained to be "the blunt instrument" from the beginning, or as a Kryptonian, he really doesn't feel any human emotions and therefore can't identify with them. His arguments are the logical conclusion to the evidence of his life.
Also, I couldn't help wondering what would happen if/when the New Kryptonians came to get Kal-El. Would he jump at the chance to go back to his own people to rule? This version of Kal-El definitely has the killer instinct of his race, so defeating Nor wouldn't be a problem, but would he opt to stay in a place where he's effectively a god or would he accept the mantle of power?
Great story.