During the Smallville fight, Superman warns the citizens to return back to their homes to avoid getting caught in between the chaos of the super-powered beings. The people lock their doors and watch as the battle takes place.
The error here is that once the military arrive and detect the presence of the Kryptonians, they immediately resorted to the use of "deadly force," without even knowing if there were still civilians present in the field of battle.
Then, within a few seconds, jets go in "Weapons free" unloading missiles unto a town still filled with people. See more
Will you not understand? Krypton's core is collapsing! We may only have a matter of weeks! I warned you, harvesting the core was suicide! It has accelerated the process of implosion!
Our energy reserves were exhausted. What would you have us do, El?
Look to the stars, like our ancestors did! There are habitable worlds within reach. We can begin by using the old outposts.
Are you seriously suggesting that we evacuate the entire planet?
No, everybody here is already dead. Give me ...