Privacy (As if it's akin to avoiding the Paparazzi? And of Jonathan Kent, no less?) was never the point, and it goes to show that you have no clue what's being discussed here. Try weighing the death of children against having a potential savior of the world rendered impotent. How about weighing the death of children against the chaos around the world? Turmoil on a societal scale driven by the collective fears and uncertainty over what would probably be the most alien (figuratively and literally) event that humans have ever faced?
Of all the talks in fiction/comics about the potency of power, real power, there's arguably no character that's a better avatar of its potency and all the dilemmas that comes with it than Superman. The exercising of real power in the real world, even if you're operating with a general desire to do good, by the way, translates into the witnessing of imbalance, injustice, including not if how many innocents will die, and making the decision of not how to right wrongs, but which ones you'll right and which ones you learn to let go.
There's an opportunity for this movie to make Superman into the complex character he might not have originally been intended to be, but has become in culture over the years. Maybe this movie will go that far, maybe it won't; but I'll take an earnest effort over some cheap feelgood good vs. evil schlock anyday.