Warning Spoilers Ahead!
What a powerful start to the movie. Seeing the destruction of Metropolis and Gotham city – a clever touch, placing the two cities across the water from each other – from the perspective of a human on the ground. Gods battling in the sky, Superman vs. Zod, pummelling each other through buildings and searing each other with heat rays; all to the sound of the Kryptonian world engine as it pulses energy into the ground shattering the city and the belief that we, puny humans, are in control of our destiny. God’s walk fly amongst us.
This reminder of our mortality as he watches Wayne Tower come down in a plume of dust, eerily reminiscent of 9-11, is what drives Bruce Wayne on his mission of ultimate risk management; Superman must be destroyed. Trusting that this alien god being, Superman, is good is not enough; if there is even the slightest possibility that Superman operates by his own rules, it is too much of a liability for the safety of the human race.