There is a matching thread going on over at the MARVEL forums.
The question is - what are the mass murder numbers in the DC Universe over the last two decades. The times where some villain or villains has killed whole swaths of people either before or after the heroes got involved.
I know Flashpoint and the New 52 and Rebirth reset a lot of things, but we are going to go by stories, not by continuity.
So, Bludhaven was bombed by villains using Chemo - according to Superman #648, just over 100,000 dead
Mongul and Cyborg Superman murder Coast City - population around 7 million
Atlantis Attacks - Ocean Master floods the eastern US coast cities of Metropololis [11 million], Boston, Gotham [10 million] and New York [8.5 million]. Assuming only 0.5% casualty rates in each of these cities and other, the death toll would be around 200,000