Do we all not watch a film with the emotive view of how it makes us feel through the very notion of what you mention, the dialogue, the actions of the characters, or a mix of both.
For example, the line 'This is my world, you are my world', thus the inspirational piece referred to in previous posts, Superman is encapsulating that he has been inspired by the people of earth by the first statement and the love of Lois in the other (he's been inspired by her)
The saving sequences - Day of the Dead, Roof top rescue - all actions/scenes that are very much in Superman's nature (indicating it's utter rubbish, that Snyder does not get Superman), he has made Earth his home, at that point, he is playing 'his side of the bargain', it is us as a race of people who do not show the faith in him UNTIL the Doomsday face off and thus in turn, Batman's shift in view.
You raise some interesting scenes and points.
You are clearly walking away from it with a far more positive interpretation than many of us.
Yes, we all want to see positives in Superman, but many of us do not see this in the movie.
I will now attempt to explain why I see these scenes very differently than you.
This is not to invalidate your interpretation, but to explain why other people do not see what you see.
The main reason being there are other things in this movie that I see that when I include them in the narrative, create problems of logic that outweigh what you see and in some cases, the obvious intent of the creative team that made the scene.
Starting with Superman's death.
"This is my world. You are my world".
I see this scene completely different from you, both motivationally and practically.
Motivationally, I see a man demonstrated throughout this movie as having lost faith in humanity. His reactions throughout the movie and the scenes show that and it is deliberate.
It is meant to show his frustration and disillusionment leading up to the climax, giving us a plausible reason for him to be absent and distracted enough for Lex to be able kidnap both Lois and Martha.
During the course of the film, he hardly speaks, either as Superman or Clark.
As though he thinks communication is either beneath him, or he's so insecure he simply cannot find words, or so depressed he hasn't the motivation to. That's my interpretation, but his lack of communication is a fact
In the entire movie, as both Clark and Superman, he speaks with only 5 people.
It progressively gets worse throughout the movie.
With the evidence of his character and mindset from the first 2 hours of the movie informing that scene, his stating that this is his world is not evidence of his regaining his faith in humanity.
There has been nothing presented in the movie to justify his change in mindset.
Believing that he has changed is an act of faith.
Faith is only logically possible in the absence of contrary evidence.
The first two hours of the movie provide ample contrary evidence.
Believing he has changed in the absence of justifiable evidence is illogical. Some people have blind faith. Many do not.
So, I see a Superman prepared to give his all to protect the woman he loves.
That in itself may be a noble sentiment, but the way he sacrificed himself was foolish and unnecessary. I'm not meant to think that, the movie does not intend that, but it provides contextual evidence so that it is the only logical conclusion, based on the evidence they put on the screen.
This is why:
He is supposed to be fighting with Batman and Wonder Woman.
The spear being Kryptonite makes him the worst possible choice to wield it for the final confrontation. Holding the spear makes him far weaker than Wonder Woman, weaker than Batman. He is also far less skilled in combat than either.
A self aware Superman who has regained his faith in an unfair and, at least as far as the movie has shown, unworthy humanity, would surely have faith and trust in the people fighting at his side.
With that in mind, unless he is meant to be an idiot, what logical reason could he have to give one of them the spear instead?
So instead of coming off as man reluctantly making a noble tragic sacrifice, as he did in the comic, the movie showed me a man completely overwhelmed by the circumstances and threw his life away in a panic to save the woman he loved.
He may have believed it was noble and brave, the movie clearly wants it to seem so, but the way they staged it means as soon as you remove the emotion of the moment and look at the circumstances, it becomes a tragic, avoidable waste.
Emotionally, I'm torn between pity for him and rage at his thoughtless imbecility.
Neither is an acceptable response to the death of Superman for me, but it is the unavoidable consequence of the structure and circumstance of the scene.
Logically, I am amazed at the stupidity of the team that presented the circumstances that utterly undermine their obvious intent
There are many ways to make that scene work the way it was intended, but the key logical problem is the spear.
In the comic, there were no Kryptonite weapons. Superman and Doomsday fight to the death bare-handed. That would have worked here.
Remove the Kryptonite spear and the major complaints and ridicule in this scene go away with it.
Why is the Kryptonite spear such a problem? The answer is simply logic.
Logically, the spear shouldn't even be in the movie.
It makes no sense for Batman to make it. If he's committed to killing Superman, why is the spear a suitable weapon?
If he is using machine guns as the follow up to the disorienting effect of the sonics, why didn't he carve Kryptonite bullets if he wants him dead?
If he can make gas grenades with Kryptonite, why didn't he make frags? A lot less effort, with far more effect.
Even leaving aside those questions, which my logical mind cannot, having Superman wield the spear at all should be impossible according to the internal logic of the movie itself.
He couldn't even stay conscious long enough with it in his hand to retrieve it from the water. Lois had to save him from drowning. The movie showed he couldn't even stand in its presence, but we are supposed to accept that he can now fly with it in his hand?
Most of the jokes, memes and ridicule about Superman's death in this film are easily preventable with the removal of the spear.
The spear is only there so Snyder can recreate King Arthur's death scene from the 1981 movie Excalibur, which he showed at the start of BvS as the movie the Wayne's had watched just before the murder of Thomas and Martha.
So Snyder's choices create the logic problems that undermine the intended gravitas of his scenes.
The saving scenes prove beyond all doubt that Snyder simply does not understand the character of Superman at all.
For one very simple reason that I've already touched on above.
He doesn't speak.
Superman always engages those he saves in conversation.
The only times he doesn't is when he does so at super speed on the way to saving someone else.
Whenever he stops, he always warmly engages.
There are many practical reasons for this.
A remote, silent automaton with that level of power is a frightening concept. Without communication to allay the natural fear, even the saved will become naturally suspicious of his motives. What does he really want? Why is he really here?
Superman speaks to show he cares, to reassure the people he saves and those watching of his genuine compassion and altruistic motives. This is then spread by word of mouth, which translates into support for and belief in the character.
It humanises him and is thus responsible for his popularity and iconic status.
Remove that and you remove the publics faith and trust, replacing it with suspicion, resentment and fear.
Snyder removes it completely.
This removal does justify the public's suspicion and fear of Superman displayed in BvS.
So perhaps he does understand the character after all and has subverted it deliberately in order to give us a powered Kryptonian character on screen that has Superman's physicality but none of his character.
That he would think this would resonate with audiences says to me that he fails to grasp what has made the character an icon in the first place.
If he believes the public wants a "new" version of Superman and his vision is it, he is clearly and demonstrably mistaken.
It may be for some, but after the reception of both MoS and BvS, it shows it does not resonate with the many in the way they thought it would.
Those are my thoughts and issues with the scenes you've described. I'd be interested to hear why the logic problems I see within the movie aren't issues for you.