Yeah, I hear where you're coming from. Superman's a pretty obvious target for zodiac-rat style moral victories. Which is a real shame, because he's nice. If he was still a superdick it'd be okay, but! He's not!
I think this is quite a good use of the 'Superman isn't Jesus' play, because personally I totally get his reaction of dude-not-cool, but I also understand and sympathise with Diana's more ruthless reasoning. It's tricky, and seeing Superman (of all people!) falter at the problem is reflective of my wobbling.