As has been pointed out, something being human doesn't equate to a universal good. Saying what Superman and Wonder Woman are doing is human isn't an excuse for bad behavior, and it's used as a theme in superhero comics to create conflict and drama. However, the point of narratives is for characters to resolve those essential conflicts. In comics, this journey is often elongated -- sometimes for such a frustratingly long time that the heroes could be said to have a Peter Pan complex -- but the key is to reflect on and overcome these personal issues in order to become fully actualized. It is in fact, the classic hero's journey to do this. Thus, it may be human but even humans are capable of courage and heroism that goes beyond what I'm seeing in Clark and Diana at present.
Originally Posted by Namtab
A crime? I said it was selfish and cowardly, which it is. Diana has no secrets to keep from Steve, so there's no issue of trust there and she did not express her reasons for pushing him away as relating to anything other than her desire not to see him come to harm. With Superman, we've gotten even less insight. In Justice League #12 he tells Diana he has to keep secrets, and in Superman #3 he mopes about not being able to answer Lois' calls for openness, but he never explicitly shares with us or anyone the reasons for his secrecy, if I recall. We are left to assume -- based on the characterization of Superman in other eras -- that his motivation is to protect Lois. Problem is, the New 52 has gone out of its way to remove the traditional reasons for this worry. Lois doesn't have a public relationship with Superman, for one, and she doesn't to find the reporter, Clark Kent, nearly as unappealing as her previous incarnations did. Moreover, Superman spoke with contentment to Lois' father General Lane that her promotion to TV news producer because it meant she wasn't in the line of fire as much as a boots on the ground investigative reporter taking the risks he did as Clark just to keep up with him as her journalistic rival. In short, the comics have yet to actually provide a solid explanation for why Superman is so reluctant to open up to Lois. It certainly hasn't been presented as a matter of trust at all.
Originally Posted by Auguste Dupin
It is cowardly for Superman to not follow his heart. This is what Alan Moore thought when he had Superman in What Ever Happened to the Man of Tomorrow? state outright on the eve of his possible doom, "[Lois and Lana] have wasted their love on me, while I couldn't let myself love either of them the way they deserved. I wish I had explained. I wish I hadn't been such a coward." It was the message in Smallville's "Promise" (except Clark was dealing with his feelings for Lana at the time):
Clark: If Lana didn't want to marry Lex, she wouldn't.
Chloe: Lana's not my hero, Clark -- you are. And this whole idea that you're still hiding who you really are, that you're giving up the one person that you totally love --
Clark: I'm protecting her.
Chloe: [ Sarcastic ] Good job. She's marrying a monster and trapping herself into a loveless life.
Clark: Chloe, you think this is easy for me?
Chloe: I think it's easier than getting hurt. You don't hesitate to run into a burning building or jump in front of a bullet because nothing can penetrate that iron flesh of yours. But the one time saving Lana means putting your heart on the line, the Man of Steel is nowhere to be found.
Clark: Letting Lana go is the hardest thing I've ever had to do, Chloe. If you don't know that, then you don't know me as well as I thought you did.
Later with his mother...
Clark: You know, I can't help but wonder... ..if all those things I told myself -- that knowing the truth about me would be too much for Lana to handle, if she knew my secret she'd be in danger - what if I just made up all those excuses because I was scared?
Martha: [ Smiling ] Then you'd be just like the rest of us.
Clark: What do you mean?
Martha: Your father and I almost didn't get married. I broke it off after a year. We had a horrible argument, and I thought I'd never see him again. You know, we came from such different worlds. Our families, the paths we were on -- everything was stacked against us.
Clark: Then why'd you get back together?
Martha: Because I... I couldn't stop thinking about him.
Clark: What if I take that risk... and Lana really is happy with Lex?
Martha: All I can tell you Clark is that, if I hadn't taken that chance, I would have lost everything that's ever meant something to me.
I never said Diana's actions and the feelings which motivated them weren't sympathetic. I am saying that feelings that are understandable and sympathetic don't equal courageous and right. Reminding me of the youthfulness of these characters only highlights to me the potential direction this arc might go. These characters are young, and at the start of their hero's journey. Therefore, these experiences or youthful missteps are likely meant to teach them something valuable about themselves so that they can grow. My feeling is that whatever Superman and Wonder Woman experience while exploring a relationship with each other will ultimately give them the wisdom and maturity that will make them grow out of each other and into people and attitudes that suit them and befit their status as heroic individuals who overcome their fears.
As for Diana, considering she just had been left to believe Steve had been murdered just to get to her when she took her decision, one can only acknowledge that her reaction was understandable, regardless of wether or not it was the right one (not to mention the "she's 23" thing).