In the entire history of Superman as a character, the issue of Superman's agency in state-level interventions is never resolved. The only time it ever has been are stories like
Injustice or
The Dark Knight Returns that leave Superman at two poles of the debate.
Injustice resolves it by making Superman dictator;
The Dark Knight Returns resolves it by making him a tool of the state.
Batman v Superman: Dawn of Justice resolves it by not resolving it. In other words, since there is no resolution that does not place Superman within the two aforementioned extremes, the only solution is to engage Superman in a conversation with the state. So that ultimately what is good and acceptable can be adjudicated on a case-by-case basis, and there is a precedent for Superman to answer for his actions.
It does not prove your point. Many versions of
Hamlet, including the 1948 Academy Award winning Olivier adaptation, are within a single digit difference in runtime compared to the theatrical release of BvS. The ultimate edition of BvS, which runs at 3 hours and 3 minutes is actually longer than most productions of
Hamlet. The only adaptations of the
Hamlet that run longer than BvS are those that include all of the material from every scene and folio version of the play.
Hamlet relies on dialogue more than BvS because it is a play to be performed on a stage. It needs the dialogue to fill the imaginations of the audience. Film is different. You can say more with less on film because it is a visual medium that can convey a lot of information with visuals, music, and performance.
I think BvS actually does address the majority of your above suggestions. For example, first responders push Superman away from the aftermath of the Capitol bombing. The Nairomi incident prompts the U.S. Senate to not just consider state level interventions like Nairomi but expands to ask "Must there be a Superman?" It deals with a farm boy in the big city through Clark's conflict with Perry White. Perry repeatedly shuts down Clark's requests to do the Batman story with pretty overt references to Clark's humble heartland background. The entire question of vigilantes is covered through the committee hearings and Clark's investigation into Batman's reign of terror in Gotham.
Superhero films can entertain while also exploring complex issues. The two aren't mutually exclusive. This is explicitly addressed in BvS:
Clark: How come dad never left Kansas?
Martha: He just...you know how he was. What do I need to travel for? I'm already there.
Clark: I just wish it were more simple.
Martha: My baby boy, nothing was ever simple.
If the only way Superman can entertain is if the world in which he exists is a fantasy world, then what is the point of him? What kind of symbol of hope can only be a symbol of hope if the world in which he exists is already a hopeful place? BvS presents the world as it is, in all of its complexity, and asks the audience to see the truth of it and conclude as the film does with its clear message embodied in Bruce's most memorable lines that bookend the film:
There was a time above...a time before...there were perfect things...diamond absolutes. But things fall...things on earth. And what falls...is fallen.
Men are still good. We fight. We kill. We betray one another. But we can rebuild. We can do better. We will. We have to.
I will never subscribe to the idea that superhero storytelling should be limited because you think so little of audiences. I do think there is a distinction between literary and non-literary storytelling (see: C.S. Lewis's
"An Experiment in Criticism"), and it's fine to have a preference for one over the other, especially for a given genre, but to argue that your way is the only way is selfish and myopic.