When in doubt, blame mythology

By the way, his Kryptonian name of Kal-El means ‘God’ in Hebrew.” (It actually translates as “Voice of God.”)...

I wanted the movie to have a mythological feeling. In ancient mythology, mass deaths are used to symbolize disasters...

- Zach Snyder, justifying the scenes of mass destruction in Man of Steel (via Charlie Jane Anders)
Because mass death in itself isn't a literal disaster, but an act of god.

Mass Murderer of Steel by Kyle Baker