I think you REALLY wasn't paying attention at all.
1. Yes, Superman killed that one African terrorist leader. It was a HUGE deal that set-up the entire plot. Not only was it acknowledge, the ENTIRE SENATE hearing was about that.
2. The movie has one of the simplest plots, but a lot of depth. The plot is simple: Does Earth need someone who is a God in man's image. Lex Luthor views Superman as the ultimate threat to mankind's existence and want Superman out of existence by way of using Batman. That is it. Everything else is subplots that links Luthor being behind everything just to set up the demise of Superman.
3. Wonder Woman's purpose was a subplot to introduce the Justice League. Lex was searching for other metahumans and discovered files on her. She learned about this and wants to get them back because she didn't want to be exposed.
4. Lex Luthor had one motivation. To kill Superman, not just physically, but also what he represented symbolically to people. That's the reason behind the staged African massacre, the suicide bombing at the Senate, and getting the military and government approved exclusive access to Supergirl's ship and Zod's body. As well as manipulating both Batman and Superman to have an automatic dislike, especially with Batman who was determined to end Superman for those same reasons that Luthor believed, but the only difference is Batman wants to kill Superman to save humanity, whereas Luthor wants it for his own selfish desire. Luthor is a narcissist with a superiority complex and even the idea of a God that can rule over man rubs him the wrong way. He takes self-gratification in a man being able to kill or control God. He explains his rationale plenty of times, not just to Superman, but as well as to Senator Finch.
5. The movie IS supposed to be about him, but it is mostly through the perspectives of everyone else. So, of course he wouldn't have many dialogue. This film is an theologian analogy to the Passion of Christ in which Jesus comes in and claims to be a savior of mankind, the people have mixed feelings about him, he's been judged, he is crucified, and in the end it is hinted to his resurrection. The parallels to this and Jesus are quite blatant. So, of course it doesn't have heavy dialogue from Superman himself, it doesn't it... it mostly from everyone else's POV.
6. Batman had every reason to see Superman as a threat. a.) he was there at ground zero and witnessed his own financial building destroyed and his employees killed or paralyzed. b.) he gets a vision and a warning about Superman and how a world under his totalitarian rule would look like (implying the whole INJUSTICE narrative). c.) he discovered the return checks by his former employee with Lex making it look like his former employee didn't have his back then seeing the Capitol building explode with Superman in it. He had motives. And, as suggested by Alfred, since the learning of Superman's existence and how it affected innocent lives that Bruce personally saw get killed, Batman's brutality increase to having zero-fukks. There's no evidence of him bring a killing machine prior to Superman. And even when the sex slave trader was caught... he didn't kill him, just branded him and that was the 1st time Clark heard of Batman's actions and ethics. And not only that, the dream/vision sequence was from an alternate timeline. Lastly, he never went out to try to kill people with the purpose to kill people with the exception of Superman because he firmly believe he needed to be dead. The car chase scene was mostly either incidental or by trafficker's own fault. The warehouse scene... he didn't really kill ANYONE intentionally. He didn't go in there guns blazing on some Punisher shyt. The people who were killed was when dude fell on his own grenade, those who self-inflicted their own deaths, and the head Russian holding Martha Kent which, BTW is literally straight from Frank Miller's TDKR graphic novel and even with that Batman didn't shot him point blank. He shot at the flame torch and that exploded into flames....without truly confirmation of if dude was dead or have extreme degree burns. He's brutal, he's doesn't give a fucck anymore but it's not out seeking to kill with that being the 1st thought.
7. You saying Superman Returns... a movie with zero action. The worst story plot ever in comic book history. And a force-fed love note to Richard Donner. You lose points for that alone.
8. The warehouse scene wasn't shown just a little bit in the trailer, not the full entire thing.
9. Lets start with the fact that Superman was holding back in the fight against Batman. But Superman used his hearing A LOT... he used his speed to get from point A to point B a lot. He definitely used his laser vision which is his deadliest weapon a lot. So what are you talking about? Who CARES if he didn't use his cooling breathe? What purpose would it serve? Lastly, it is very much implied that he used his X-ray vision a number of times. Afterall, it is how he knew who Batman was.
10. Superman used his speed to get anywhere at a blink of an eye. He is capable of all the things you said, except he CANNOT see or hear through LEAD not that means anything. What he also cannot do is read minds. How the hell could he know where his mom IS? Saying to use so-called super hearing. It DOESN'T WORK LIKE THAT. It's not like he can hear everything everywhere. Even that has limits. That's like Quinn telling Han "We could use the FORCE"... dummy... it doesn't work like that.
11. Again, if he was to find where his mother was within time... she would of been killed. PERIOD. It was that simple. Plus, you dismiss the fact that Lex had a contingency plan and was creating doomsday already and he was using Superman to buy that extra time if Batman wasn't able to do the job.
12. Again, Superman didn't want to fight Batman to begin with. 2nd of all, Batman was in his protective suit that prevents him getting knocked out, and lastly he had extra rounds of Kryptonite gas grenades to ensure Superman can be out of commission. Other words, Batman had PREP-TIME.
13. The Knightmare scene is arguably one of the most important foreshadowing scenes implying INJUSTICE being part of the upcoming Justice League movie.
14. So, the African massacre, the Senate bombing, the Flash visions, the metahuman files, oh and the DEATH OF SUPERMAN is all from the trailers. Okay.
15. Again, not even paying attention Bruce stated the Superman coffin is empty. And the conversation is straight corn? How? Because Bruce told Diana that they need to recruit for form a Justice League due to his own foreshadowed predictions to what's to come?
16. And there it is.... Marvel stan boyisms. But you WB still got your money!
and seconds away from getting stabbed in the heart by Batman. 
Wasn't the deal to provide a deterrent for supes (under the table) but lex needed clearance to get the kryptonite in, general zod's body, and access to the ship. No deal if everyone involved is dead 
. Again, I'm not a comic head. If that's how Lex Luthor was at one point in the comics, then I guess it makes sense to have him portrayed that way. But the Lex Luthor I know is a more cerebral version of Netflix's take on Kingpin in Daredevil. Intimidating and extremely smart.
was the point of making Doomsday again?
