I'm talking context, breh. You don't focus on the deaths in these things ever (that goes for disaster movies as well) because when you do (Man Of Steel), it doesn't just become grim, it becomes morbid. Collateral damage happens all the time, but you don't put it in people's faces because there would be nothing left to root for.
Think about Civil War (the comic event). Several city blocks including a public school get decimated, with hundreds of casualties. But outside of one frame showing the silhouettes of playing children looking up at the light of the explosion before the moment, they don't depict the deaths. Because doing so would drastically change the tone.
I get that, and while that would make an interesting angle, Superman is not the character you use to tell that story because he is a symbol for the complete opposite of what Snyder is trying to do here. If he wanted to tell that story he should've chosen to adapt something like Mark Waid's Irredeemable instead.
It's the same problem how in Watchmen Rorschach and The Comedian are supposed to be completely off the handle right wing psychopaths/sociopaths, but in a fight scene Snyder depicts Nite Owl and Silk Spectre (both being closer to romanticizing thrill seekers) to be almost as ruthless and violent fighting criminals as the former two because that fits Snyder's idea of 'realistic superhero fights', with no regard of the narrative context. That's a big problem with Snyder's adaptations (it wasn't with 300 only because that pretty much fit his vision perfectly), and as long as he doesn't that get that in order, his movies will suffer from it.