And I've heard that argument and can respect it but my opinion is that in the middle of a fight and that particular fight, he doesn't have time to pause for that reflection and it would've been nice if it came at the tail end of the fight with Zod but then you would've erased the beat of him being angry and or sad that he had to kill Zod. And again, from what I've read, that's going to be a huge part of the next movie, dealing with the aftermath of that battle and him being perceived as a threat more than a hero because of the damage and destruction.