How is he brooding and depressed? He is coming to terms that he is a alien super powered being that should use his power for good while also maintaining his civilian life, and he is also seen as a threat and is misunderstood by the very people he is trying to protect. Any real person would have a multitude of emotions and feelings if they had to deal with that.
If you read John Byrne's Superman run, Cavil isn't that isn't that far off from that interpretation.
Not only is that the energy he gives off to me,he even said it himself
The man is telling you that he is only doing this because he thinks "changing the world" for the better its what his father wanted. Then in that same movie he tells Lois "you are my world" which was a call back to what Clarks father said about Martha . Saying she gave him faith there was good in the world and became his world. This is Superman essentially telling us he doesn't give a fukk about the rest of us because he does it all for Lois like homie said lol.
This Superman is like if it ain’t Lois then why can’t these people stay out of trouble.
I will admit it actually all makes sense after reading what Snyders ultimate plan was. Its easy to see how a pregnant Lois being killed would make it so easy to turn this Superman against the world. Deep down this version of Superman doesn't actually give a damn about anybody but himself and Lois anyway. Say what you will,but a Superman who isn't genuinely a good person,and isn't a man of the people,ain't my Superman.
Plus to me it really betrays what we saw in MOS,which was a guy who wanted a normal life. But couldn't stop doing the right thing even for strangers,even at the risk of exposing himself. Even with his father in one moment telling him not to do the right thing. If the idea is we are supposed to be watching Superman devolve into a villian for the past couple movies,then Snyder got it right I guess. But there won't really be a pay off, because this version of Superman becoming evil wouldn't be suprising. Darkseid could probably just set Clark up using a sexy decoy,and get Lois to dump him. 95% chance this version of Superman would go on a mass shooter esque rampage without using the Anti Life Equation smh.