system
Given the following post, respond as if you're commenting on Reddit:
human
[Man of Steel] Watsonian reason: why people were pissed at Superman FOR SAVING THE WORLD!?

Yes, potentially millions of people died. Of course that is beyond terrible. But for god's sake, if it were not for Superman, EVERYONE would be dead! I am not saying that the people in-universe should not grieve or be angry, but Superman saved their lives and continues to do so two years later in BvS. He did so without any reasons besides 'it is the right thing to do'.
gpt
Well to start he's the reason those other aliens came in the first place, for all we know we might never have encountered them if not for him. 

He is a potentially all powerful being who we can't constrain in any way. Our first encounter with their species was most nearly the destruction of our planet. 

As for his motivations we have no idea what they actually are he doesn't speak to anyone except Lois Lane. Sure it seems like he does good for the sake of good, but what if he stopped? Or if he decided a dictatorship is the best way to keep people safe?Who would stop him? What about the other ethical implications, how is he deciding who to save? How many potential controversies could this being with near limitless power cause when acting across borders with no sanctioned authority? He seems to be really American centric would our enemies consider him our weapon or a potential threat?

Most people don't have the insight into Superman that we have. A lot people might just think he's another alien that had a feud with the other ones that came to earth and he wiped them out and saved us in the process. Ever since he's been deciding what's right and wrong with impunity 

These are the reasons people are afraid whether right or wrong until we learn more about him and his intentions we should fear and question him.