If the Davis situation had never happened, I'd expect Clark to be willing to try changing Zod or reaching him. But the Davis situation did happen, and Clark wouldn't be a person if he didn't re-evaluate how his own belief system might have contributed to it, and whether he needs to adjust that belief system going forward.

That definitely makes sense, and I can see that Clark still isn't quite Superman yet, so he has some learning to do. It may even be a wiser decision for him *not* to give Zod the benefit of the doubt; this Zod is clearly a lot closer to the one who destroyed Krypton than he is to Jor-El's good buddy. I'm just not sure how, after Davis *and* Zod, that Clark's ever going to get back to the place where he tries to change villains by believing in them--so I have a hard time not seeing this as a step backward.