What are you called when you kill 100,000 Iraqis?
It's probably relatively easy to dismiss 100,000 vs 1 million or 10 million, since in a way it just looks like "statistics". But look at it another way. How did you feel when someone close to you die? Just that one person, not 5 more, or 100x more. Now multiply how you felt by 100,000 times, and think about the damage to human life that was created.
Does it really matter that 1 million is 10x bigger than that, or is 100,000 "enough" to think the damage is immense?