So again... Why have the killing as the climax of the movie if it's really got nothing to do with anything?
		
		
	 
First... 
Superman VS Zod is not the climax of the film. It's the falling action of the story, preceding the denouement. The climax of the story is the threat posed by the World Engine and the larger threat of the Kryptonians.
Why have the killing be the focal point? Because that happens to be how Superman defeats Zod, and Zod's defeat is the resolution of the movie's falling action. 
Much like how other heroes in other movies have defeated the villain by killing them. Only here, instead of saying something pithy and sarcastic, Superman falls to his knees in grief. 
	
	
		
		
			Same question as above. The burden part of his arc comes from "How will the world react to me?" What's that got to do with killing an enemy?
		
		
	 
Because "how will the world react to me" is only part of his burden.
His burdens include this existing psychological concern, but also new physical and emotional ones, and these unfold throughout the movie.
	
	
		
		
			In all the years people have been having this argument, this is the first time I've ever seen anyone trying to say it was partly about helping he and Lois bond.
		
		
	 
Did people not watch the scene? 
Why do you think Lois is in the scene?
The moment following Zod's death is clearly about Superman's grief, and him and Lois bonding. She's literally holding him while he is in grief. That is a bonding activity between two people.
	
	
		
		
			So okay-- How? How are they more bonded after the neck snap than they were before, and why did it matter? What did it say about their relationship? Why did it need to be said? How was it carried forward?
		
		
	 
How are they more bonded after it? Because she witnesses his peril, she witnesses what he has to do, and she witnesses his reaction to doing so. She starts to understand his burden, who he really is underneath all the power, and he now has someone to share his issues with.
It says that they can go through awful things together and have someone to share it with. This kind of thing makes couples stronger.
How was it carried forward? She continues to attempt to understand and try to relate to his burdens in BVS.
	
	
		
		
			All this jumping through hoops to try and make sense out of it, but we know the reason already-- Snyder says he thought the no kill rule had to come from him killing and not liking it. Nothing to do with something being necessary not feeling good, certainly nothing to do with Lois. It was part of Snyder's cynical and poor understanding of a virtuous character, and poor storytelling.
		
		
	 
The fact that the killing is "necessary" is clearly outlined in the movie.
The fact that it makes him feel awful is also clearly shown in the movie.
And I'm sorry, if it has nothing to do with Lois...then why is Lois in the scene?
There's no "jumping through hoops" required to explain that a hero kills a villain to stop that villain from doing harm to innocents, even though the hero may not want to do so.
That's an old, old story, and is clearly shown onscreen.
As for Snyder and his "poor understanding of a virtuous character"...we talking about the same virtuous character who kills Zod and several other Kryptonians in a key arc in the comics and felt awful about it afterward?
Or could it be the virtuous character who sacrifices his future happiness and his life to stop Doomsday in BVS?
Because we all know there's nothing but cynicism and a lack of virtue in saying "This is my world" and sacrificing yourself to save it.